39 products were found matching your search for Ackermann in 3 shops:
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The Ackermann Military Prints: Uniforms of the British and Indian Armies 1840-1855 (Schiffer Military History Book)
Vendor: Abebooks.com Price: 29.99 $For many years the magnificent color prints published by the firm of Rudolf Ackermann during the 19th century have been in the possession of lucky collectors. However, with the passing of many years these frail works of art have become damaged, or have perished, so that many are not available to those who wish to find and appreciate the work and care which went into these productions.
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Celestron Light Pollution Imaging Filter f/Rowe-Ackermann Schmidt Astrograph 11
Vendor: Adorama.com Price: 569.99 $Why settle for less when you can capture the cosmos in all its glory with the high-quality Light Pollution Imaging Filter for Rowe-Ackermann Schmidt Astrograph (RASA) 11"? This innovative filter, custom-designed by Celestron and Astrodon, is your ultimate solution to light pollution challenges in astrophotography. This advanced filter is specifically engineered to enhance your experience with the Celestron Rowe-Ackermann Schmidt Astrograph, even in light-polluted environments. With its generous 72mm diameter, it effortlessly accommodates the largest sensors of today's cameras, ensuring you never miss a detail. The Light Pollution Imaging Filter for RASA is a testament to the collaborative genius of Celestron engineers and Astrodon, the world's leading imaging filter company. The outcome is a durable and effective light pollution suppression filter that optimizes your astroimaging experience. This innovative filter replaces a placeholder glass in the optical path, ensuring RASA's precise optical path remains unaltered. It's not just about removing light pollution; this filter is designed to keep your images bright and vibrant. In light-polluted areas, skyglow can degrade the quality of your astrophotography images. This filter selectively blocks light emitted from common streetlights and other ambient lighting, without compromising the total light throughput. Unlike most light pollution filters, the Light Pollution Imaging Filter for RASA preserves over 90 percent of the light captured by your telescope at many wavelengths, ensuring your images never appear too green or blue. The Celestron LP Imaging Filter for RASA stands out with its neutral color balance. Its dielectric coatings further enhance light transmission, allowing you to bring out subtle color in galaxies and other faint deep sky objects. The filter also features anti-reflective coatings to prevent star halos and minimize internal reflections. Every Celestron Light Pollution Imaging Filter undergoes individual testing for light transmission. You'll receive the actual transmission spectrum for your specific filter, prepared by Astrodon and matched to your filter's serial number. This ensures you have total confidence in your filter's performance and the quality of your astrophotography.
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Celestron Advanced VX800 8" Rowe-Ackermann Schmidt Astroscope (RASA) Telescope
Vendor: Adorama.com Price: 2,999.00 $Experience the pinnacle of celestial imaging with the Celestron Advanced VX800 8" Rowe-Ackermann Schmidt Astroscope (RASA), a powerful and innovative telescope designed for the modern astrophotographer. This advanced astrograph system pairs the high-quality 8" RASA with the robust and portable Advanced VX German equatorial mount, creating an unparalleled stargazing package that's ready for your mirrorless camera to capture the cosmos in stunning detail.The 8" RASA is a marvel of optical engineering, featuring a fast f/2.0 focal ratio and a patented optical design that eliminates the need for an autoguider in many situations. Its large 8-inch aperture allows for an influx of light, ensuring that your images are bright and clear, with razor-sharp stars across a wide field of view. The telescope's flat field without optical aberrations provides exceptional contrast and resolution, allowing you to observe celestial wonders with more detail than ever before.Weighing just 17 pounds, the 8" RASA is not only powerful but also highly portable, making it easy to transport to remote dark sky locations. Its shorter 400mm focal length reduces the demands on equatorial tracking, allowing for shorter exposure times and the potential for virtual "real-time" observing when paired with the appropriate live stacking software and sensitive cameras.Celestron's Ultra-Stable Focus System is a standout feature, incorporating precision bearings to ensure minimal lateral movement of the primary mirror, resulting in easier and more accurate focusing. This system is a testament to Celestron's commitment to providing durable and reliable equipment for serious astronomers.Designed with today's technology in mind, the 8" RASA is optimized for use with color astronomical CMOS cameras, smaller CCD cameras, and mirrorless cameras. It is specifically tailored for sensors up to a 22mm diagonal but can also accommodate sensors as large as 32mm diagonal. The telescope's compatibility with APS-C sized sensors and 42mm full-frame sensors, although with some limitations at the edges, makes it a versatile choice for a variety of camera setups.The Advanced VX mount, included in this package, is a testament to Celestron's innovative technology. It features All-Star Polar Alignment, Celestron PWI telescope control software, SkyAlign, and permanently programmable periodic error correction (PPEC). Whether you're a seasoned imager or a newcomer to the field, the Advanced VX mount provides a user-friendly experience with its computerized GoTo capability and sturdy 2" diameter steel tripod legs, ensuring stability and a payload capacity of 30 lbs.To enhance your astronomical journey, Celestron includes the Celestron PWI Telescope Control Software, co-developed with PlaneWave Instruments, offering an advanced graphical planetarium interface and comprehensive ASCOM telescope interface. Additionally, your purchase grants you access to a free download of Celestron's Starry Night Special Edition...
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Celestron CGX 800 Rowe-Ackermann Schmidt Astrograph RASA Telescope
Vendor: Adorama.com Price: 4,599.00 $This kit combines the 8" Rowe-Ackermann Schmidt Astrograph (RASA) with the state-of-the-art CGX German equatorial mount. Simply add a camera and this package offers everything you need to take spectacular images of wide-field deep sky objects. Although about the same size as the CGEM II, the CGX is a big step up in performance and features, especially for imaging applications. RASA Performance Made for Everyone Capture spectacular wide-field deep sky images in seconds with Celestron's new portable astrograph, the 8" Rowe-Ackermann Schmidt Astrograph (RASA). This incredibly fast f/2.0 system is the perfect companion to today's color astronomical CMOS cameras, smaller CCD cameras, and mirrorless cameras. Thanks to its fast focal ratio and patented optical design, you can produce sharp, detailed images and, in many cases, skip the autoguider completely. Weighing in at just 17 pounds, it's easy to transport your 8" RASA to the most remote dark sky locations. The 8" RASA is an imaging telescope that delivers a flat field without optical aberrations for razor sharp stars across a wide field of view. It can capture stunning deep-sky astronomical images without the challenges typically presented by longer focal length instruments at a fraction of the cost of those systems. The latest addition to the RASA family, this 8" version is a much more portable and affordable version of the heralded RASA 11, which was introduced to much acclaim in 2014. With the 8" RASA joining the lineup, a wider range of astroimagers can enjoy the benefits of the RASA design. It has many of the same thoughtfully designed features as its "big brother" RASA 11, including the integrated air-cooling system, internal filter mount, and sturdy CGE dovetail mounting bar. Purely designed for imaging, the 8" RASA cannot be used visually. The prime focus focal plane is located at the front of the optical system, so it cannot accommodate a traditional eyepiece. Shorter Exposure Times and Virtual "Real-Time" Observing Since it is an F/2.0 optical system, imagers can use shorter exposure times to capture detail in faint objects. When combined with sensitive cameras and the proper "live stacking" software, the 8" RASA can provide an almost real-time observing experience. View images on a computer instantly that are brighter and more detailed than can be seen in much bigger telescopes with the naked eye. Because shorter exposure times are possible, your equatorial mount won't need to accurately track over extended periods. The 8" RASA's relatively short 400mm focal length also lessens equatorial tracking demands. In many cases, autoguiding will not be required. Weighing only 17 lb, this optical tube pairs perfectly with a wide variety of mounts. Ultra-Stable Focus System With the launch of the 8" RASA, Celestron is unveiling a new focuser design that mitigates lateral movement of the primary mirror when focusing, slewing, or tracking with the astrograph. Focusing is...
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Celestron 36cm Rowe-Ackermann Schmidt Astrograph RASA Telescope
Vendor: Adorama.com Price: 13,999.00 $Take your astrophotography to the next level with the 36cm Rowe-Ackermann Schmidt Astrograph (RASA) Telescope, a pinnacle of Celestron's innovative optics technology. This high-quality, durable astrograph is designed for the serious astrophotographer who demands sophisticated and advanced equipment for space surveillance, Space Situational Awareness (SSA), and other scientific applications.The RASA Telescope stands out with its large 14-inch (355mm) aperture, which significantly enhances its light-gathering capability, resulting in brighter and more detailed images of the cosmos. Its fast f/2.2 optical system allows for rapid image capture, making it ideal for capturing fleeting celestial events and detailed wide field astroimaging.Celestron's RASA design is optimized for a flat focal plane, ensuring sharp focus all the way to the edge of its expansive field of view. This innovative design eliminates common optical defects such as field curvature, off-axis coma, and astigmatism, providing you with pristine, professional-grade images.As the largest RASA model Celestron offers, this telescope is unmatched in its class, providing an "off-the-shelf" solution that rivals custom-built instruments. The extended spectral range focus (400-900 nm) of the RASA 36 cm allows for a brighter signal capture, enhancing the capabilities of your camera sensor and ensuring superior image quality.The telescope's redesigned focus system is a testament to Celestron's commitment to user-friendly, stable, and precise focusing. With an ample back-focus distance of 77.5 mm, the RASA 36 cm is versatile enough to accommodate a wide array of imaging sensors. For those seeking an even broader perspective, a custom camera adapter can be added to achieve an impressive field of view up to 4.4 degrees.Choose the 36cm Rowe-Ackermann Schmidt Astrograph RASA Telescope for its unparalleled aperture, speed, and field of view, and join the ranks of astrophotographers who trust Celestron's legacy of quality and performance.
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Celestron 8" f/2.0 Rowe-Ackermann Schmidt Astrograph RASA Telescope, OTA Only
Vendor: Adorama.com Price: 2,079.00 $Explore the cosmos with the 8" f/2.0 Rowe-Ackermann Schmidt Astrograph (RASA) Telescope, a cutting-edge portable astrograph from Celestron. This state-of-the-art telescope is designed to capture breathtaking wide-field deep sky images in mere seconds, making it an ideal companion for today's advanced color astronomical CMOS cameras, compact CCD cameras, and mirrorless cameras. The 8" RASA Telescope boasts a fast f/2.0 system, a patented optical design, and a lightweight build of just 17 pounds, making it an easy-to-transport tool for your astronomical adventures. Its fast focal ratio allows you to produce sharp, detailed images, often eliminating the need for an autoguider. This imaging telescope is engineered to deliver a flat field without optical aberrations, ensuring razor-sharp stars across a wide field of view. It's capable of capturing stunning deep-sky astronomical images without the challenges typically associated with longer focal length instruments, and at a fraction of the cost. The 8" RASA is the latest addition to the RASA family, offering a more portable and affordable alternative to the highly acclaimed RASA 11. Despite its smaller size, it shares many of the same innovative features as the RASA 11, including an integrated air-cooling system, internal filter mount, and sturdy CGE dovetail mounting bar. Designed purely for imaging, the 8" RASA does not accommodate traditional eyepieces as the prime focus focal plane is located at the front of the optical system. However, its F/2.0 optical system allows for shorter exposure times, capturing detail in faint objects. When paired with sensitive cameras and the right "live stacking" software, the 8" RASA can provide an almost real-time observing experience, displaying images on a computer that are brighter and more detailed than what can be seen through larger telescopes with the naked eye. The 8" RASA also introduces a new Ultra-Stable Focus System, designed to minimize lateral movement of the primary mirror when focusing, slewing, or tracking. This new design makes focusing easier, more accurate, and more stable than ever before. Unlike larger RASAs, the 8" model is optimized for color astronomical CMOS cameras, smaller CCD cameras, and mirrorless cameras. It is not compatible with standard DSLR cameras. It performs best with sensors up to a 22mm diagonal, but can also work well with sensors up to 32mm diagonal. The 8" RASA's unique optical design, which is patented (US 2016/0299331 A1), consists of a Schmidt corrector, primary mirror, lens group, and optical window. The lens group contains four elements and utilizes rare-earth elements. The telescope's optics are designed to perform over a wider spectral range, from 390-800nm, allowing more of the light emitted from the astronomical object to be sharply focused in the image. Celestron's 8" RASA Telescope is a powerful tool for any astroimager, offering superior optical performance, field illumination, and a unique design that sets it...
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Celestron 8" f/2.0 Rowe-Ackermann Schmidt Astrograph RASA Telescope Imaging Kit
Vendor: Adorama.com Price: 2,499.00 $Find the perfect tool for capturing breathtaking wide-field deep sky images with the 8" Rowe-Ackermann Schmidt Astrograph (RASA) Telescope. This portable astrograph from Celestron is designed to work seamlessly with today's color astronomical CMOS cameras, smaller CCD cameras, and mirrorless cameras. Its fast f/2.0 system, combined with a patented optical design, allows you to produce sharp, detailed images in seconds, often eliminating the need for an autoguider.Weighing just 17 pounds, the 8" RASA Telescope is easy to transport to remote dark sky locations. Its imaging capabilities deliver a flat field without optical aberrations, resulting in razor-sharp stars across a wide field of view. Capture stunning deep-sky astronomical images without the typical challenges presented by longer focal length instruments, and at a fraction of the cost.This 8" RASA Telescope is a more portable and affordable version of the acclaimed RASA 11. It boasts many of the same features, including an integrated air-cooling system, internal filter mount, and sturdy CGE dovetail mounting bar. However, it's important to note that this model is purely designed for imaging and cannot be used visually.Thanks to its F/2.0 optical system, you can use shorter exposure times to capture detail in faint objects. When paired with sensitive cameras and the appropriate "live stacking" software, the 8" RASA Telescope can provide an almost real-time observing experience. View images on a computer instantly that are brighter and more detailed than can be seen in much larger telescopes with the naked eye.The 8" RASA Telescope features a new Ultra-Stable Focus System, which mitigates lateral movement of the primary mirror when focusing, slewing, or tracking with the astrograph. This makes focusing easier, more accurate, and more stable than ever. The system is built on two sets of precision bearings that are precisely aligned and tested during assembly to ensure optimal results.Unlike larger RASAs that work with DSLR and large CCD cameras, this 8" model is designed with color astronomical CMOS cameras, smaller CCD cameras, and mirrorless cameras in mind. It is optimized for sensors with up to a 22mm diagonal but performs well with sensors up to 32mm diagonal. The unique optical design of the RASA Telescope is patented and consists of a Schmidt corrector, primary mirror, lens group, and optical window. The lens group contains 4 elements and utilizes rare-earth elements. The telescope's optics are designed to perform over a wider spectral range, from 390-800nm, allowing more of the light emitted from the astronomical object to be sharply focused in the image.Celestron offers a Light Pollution Imaging Filter designed specifically for the 8" RASA, which mounts in place of the optical window. All refractive optical surfaces are coated with StarBright XLT coatings, while the primary mirror uses enhanced aluminum coatings. This maintains high light transmission through the entire optical...
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Celestron Light Pollution Imaging Filter f/Rowe-Ackermann Schmidt Astrograph 8"
Vendor: Adorama.com Price: 274.99 $Light pollution in the night sky can significantly degrade contrast in astronomical images. This is especially true when using very fast telescopes like the 8" RASA because the sky background saturates very quickly. The "noise" of the light pollution overwhelms the "signal" from the celestial object you are imaging, making it difficult to get the most detailed image. The Light Pollution Imaging Filter for the 8" RASA remedies this by blocking light pollution while transmitting light from deep-sky objects. The result is bright, detailed objects that pop off the black sky background with superior contrast. Fortunately, many sources of light pollution have relatively discreet emission spectra; they emit primarily at specific wavelengths of light. By strategically blocking these wavelengths, the filter greatly reduces the effects of light pollution without degrading overall image quality. The Light Pollution Imaging (LPI) Filter for the 8" RASA blocks light from some of the most common sources of light pollution between 400-700nm (i.e., the visible spectrum), including high- and low-pressure sodium-vapor streetlights, mercury-vapor streetlights, and natural airglow caused by oxygen in the atmosphere. Unlike some light pollution filters, the LPI filter blocks only specific areas of the spectrum instead of wide regions. This helps to maintain image brightness and color balance. In addition, specific wavelengths associated with emission nebulae, such as H-alpha(656nm), H-beta(486nm), OIII (496nm and 501nm), and SII (672nm), are highly transmitted, ensuring minimal loss of image brightness for those objects. The filter fits directly into the internal filter mount in the RASA 8's front lens cell, where the optical window normally mounts. By removing the clear window and replacing it with the filter, optical performance for the entire system is maintained.Each filter comes with a plastic storage case to safely store the filter or the placeholder glass that came with your RASA when not in use. You will also receive a spectral transmission graph unique to your specific unit, verifying its performance.
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Celestron CGX-L 1100, 11" Rowe-Ackermann Schmidt Astrograph (RASA) Version 2
Vendor: Adorama.com Price: 8,099.00 $If you're an astronomy enthusiast or a professional astrophotographer, the CGX-L 1100, 11" Rowe-Ackermann Schmidt Astrograph (RASA) Equatorial Telescope - Version 2 is a high-quality, durable, and advanced piece of equipment designed to elevate your stargazing and imaging experience. This innovative telescope boasts a large 11-inch aperture, allowing for an influx of light that results in brighter, clearer, and more detailed images of celestial objects.The sophisticated Rowe-Ackermann Schmidt optics system, coupled with a 4.48-inch eyepiece, provides a wide field of view, making it easier to locate and observe celestial bodies. This advanced-level imaging setup sets a new standard in astroimaging systems, producing images in a fraction of the time compared to other optical tubes.The CGX-L mount is designed to provide superior performance for larger telescopes, taking full advantage of Celestron's most advanced technologies. These include All-Star Polar Alignment, Celestron PWI telescope control software, Starry Night Special Edition software, SkyAlign, and permanently programmable periodic error correction (PPEC).The RASA V2 is the perfect companion to today's top DSLR or astronomical CCD cameras, offering a fast, wide-field f/2.2 system for shorter exposure times without sacrificing resolution. The short focal length lessens equatorial tracking demands, and in many cases, autoguiding will not be required.The RASA 11 V2 features 4-element rare-earth glass optics for images free of false color and aberrations like coma and field curvature. The optical quality and spot size across the entire image circle are unprecedented for an astrograph in this price range.The RASA 11 V2 also utilizes the new Ultra-Stable Focus System (USFS), which minimizes focus shift and mirror flop. The integrated 12V DC MagLev fan reduces cooldown time and provides optimal airflow through the dust filtered optical tube.Celestron's CGX-L computerized equatorial mount is the pinnacle of our fully computerized equatorial mount series. It is capable of carrying Celestron's largest optical tubes with ease, making it perfect for backyard observatories and remote imagers looking for exceptional load capacity to weight ratio, compact design, and innovative features that fully support large telescopes, imaging kits, and the latest in wireless tech accessories.In conclusion, the CGX-L 1100, 11" Rowe-Ackermann Schmidt Astrograph (RASA) Equatorial Telescope - Version 2 is a sophisticated, high-quality, and advanced tool for any astronomy enthusiast or professional astrophotographer. Its innovative features and superior performance make it a standout choice in the field of astroimaging systems.
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Celestron CGX 1100, 11" Rowe-Ackermann Schmidt Astrograph (RASA) Version 2
Vendor: Adorama.com Price: 6,499.00 $The CGX 1100 Rowe-Ackermann Schmidt Astrograph Equatorial Telescope (CGX 11" RASA) sets a new standard in astroimaging systems at an extremely affordable price. The CGX 11" RASA telescope is an excellent advanced-level imaging setup. The Rowe-Ackermann Schmidt Astrograph (RASA) produces images in a fraction of the time compared to other optical tubes. The CGX mount provides superior performance for larger telescopes while taking advantage of Celestron's most advanced technologies: All-Star Polar Alignment, Celestron PWI telescope control software, Starry Night Special Edition software, SkyAlign, and permanently programmable periodic error correction (PPEC).ror correction (PPEC). If you're an experienced imager, you'll love taking this mount to a dark sky site and enjoying all the conveniences of a larger observatory mount. Rowe-Ackermann Schmidt Astrograph Features Capturing impressive deep-sky astroimages is easier than ever with Celestron's Rowe-Ackermann Schmidt Astrograph (RASA) V2, the perfect companion to today's top DSLR or astronomical CCD cameras. This fast, wide-field f/2.2 system allows for shorter exposure times compared to traditional f/10 astroimaging, without sacrificing resolution. Because shorter sub-exposure times are possible, your equatorial mount won't need to accurately track over extended periods. The short focal length also lessens equatorial tracking demands. In many cases, autoguiding will not be required. RASA 11 V2 builds on the legacy of Celestron's Schmidt Cameras, which allowed astrophotographers to produce images with much shorter exposure times on film in the 1970s. Today, with CCD sensor sizes as large as film or larger, the RASA 11 V2 offers a 43.3mm optimized image circle to capture pinpoint stars on the largest imaging chips. Optical performance for huge sensors with diagonals of up to 52mm wide is still excellent. Combine this large image circle with a focal length of just 620mm and you have an instrument suitable for wide-field imaging, creating huge mosaics of the night sky, surveying, and even comet hunting. Optical Performance The RASA 11 V2 features optics with 4-element rare-earth glass for images free of false color and aberrations like coma and field curvature. The optical quality and spot size across the entire image circle are unprecedented for an astrograph in this price range or even that of a much more expensive instrument. The design also provides minimal vignetting. Advanced Features RASA 11 V2 utilizes the new Ultra-Stable Focus System (USFS). At the heart of this system is a precision linear ball bearing. The bearing serves to minimize focus shift (unwanted lateral motion of the primary mirror during focusing which causes shifting of the image) and mirror flop (movement of the primary mirror when the telescope is pointing to different positions in the sky). The USFS is also compatible with the optional Celestron Focus Motor (#94155-A). The integrated 12V DC MagLev...
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Celestron CGX-L Equatorial 1100 Rowe-Ackermann Schmidt Astrograph RASA Telescope
Vendor: Adorama.com Price: 6,499.00 $Explore the cosmos with unparalleled clarity using the Celestron CGX-L Equatorial 1100 Rowe-Ackermann Schmidt Astrograph RASA Telescope, a high-quality instrument designed for the serious astronomer and astrophotographer. This sophisticated and durable telescope is a testament to Celestron's legacy of innovative astronomical equipment, offering advanced features for capturing breathtaking deep-sky images.The Rowe-Ackermann Schmidt Astrograph boasts a large 11-inch (280mm) aperture, providing an expansive light-gathering capability to produce brighter, more detailed observations of the night sky. Its fast, wide-field f/2.2 optical system is a game-changer, offering two significant advantages over traditional f/10 systems: superior apparent tracking and the ability to achieve stunning astroimages with shorter exposure times. This means you can create exquisite celestial photographs quickly and efficiently, without the necessity of an autoguider.Celestron's cutting-edge optical design includes a 4-element lens group made of rare-earth glass, ensuring images are free from chromatic aberration and common distortions like coma and field curvature. The optimized 43.3mm image circle is perfect for capturing pinpoint stars across the largest imaging sensors, making it ideal for wide-field imaging, creating vast mosaics of the night sky, surveying, and comet hunting.The Rowe-Ackermann Schmidt Astrograph's optical performance is further enhanced by minimal vignetting and a focal length of just 620mm. The custom-engineered linear brass focuser bearing, coupled with the FeatherTouch Micro Focus Knob, provides the precision required for capturing the perfect shot. A 12V MagLev fan ensures rapid cooldown and maintains optimal airflow, equipped with a dust filter to preserve the integrity of the optical path.The CGX-L mount, a cornerstone of Celestron's computerized equatorial mount series, supports the astrograph with exceptional load capacity, compact design, and user-friendly features. It is engineered for both backyard observatories and remote imagers, boasting larger 144mm diameter worm wheels for smooth operation and precise control of heavier loads. The extended 270mm dovetail saddle accommodates larger optical tubes, while integrated home and limit optical sensors, improved polar alignment adjustments, and enhanced cable management make for a seamless user experience.Mechanical and ergonomic improvements throughout the mount ensure it is sturdy, intuitive to use, and easy to transport, making it the ideal companion for the advanced Celestron astrograph. Whether you're capturing the intricate details of distant galaxies or surveying the night sky, the Celestron CGX-L Equatorial 1100 Rowe-Ackermann Schmidt Astrograph RASA Telescope is engineered to deliver superior performance for discerning astronomers and astrophotographers.
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Celestron 11" Rowe-Ackermann Schmidt Astrograph RASA Optical Tube, Version 2
Vendor: Adorama.com Price: 4,399.00 $Capturing impressive deep-sky astroimages is easier than ever with Celestron's Rowe-Ackermann Schmidt Astrograph (RASA) V2, the perfect companion to today's top DSLR or astronomical CCD cameras. This fast, wide-field f/2.2 system allows for shorter exposure times compared to traditional f/10 astroimaging, without sacrificing resolution. Because shorter sub-exposure times are possible, your equatorial mount won't need to accurately track over extended periods. The short focal length also lessens equatorial tracking demands. In many cases, autoguiding will not be required. RASA 11 V2 builds on the legacy of Celestron's Schmidt Cameras, which allowed astrophotographers to produce images with much shorter exposure times on film in the 1970s. Today, with CCD sensor sizes as large as film or larger, the RASA 11 V2 offers a 43.3mm optimized image circle to capture pinpoint stars on the largest imaging chips. Optical performance for huge sensors with diagonals of up to 52mm wide is still excellent. Combine this large image circle with a focal length of just 620mm and you have an instrument suitable for wide-field imaging, creating huge mosaics of the night sky, surveying, and even comet hunting. Optical Performance The RASA 11 V2 features optics with 4-element rare-earth glass for images free of false color and aberrations like coma and field curvature. The optical quality and spot size across the entire image circle are unprecedented for an astrograph in this price range or even that of a much more expensive instrument. The design also provides minimal vignettin Advanced Features RASA 11 V2 utilizes the new Ultra-Stable Focus System (USFS). At the heart of this system is a precision linear ball bearing. The bearing serves to minimize focus shift (unwanted lateral motion of the primary mirror during focusing which causes shifting of the image) and mirror flop (movement of the primary mirror when the telescope is pointing to different positions in the sky). The USFS is also compatible with the optional Celestron Focus Motor (#94155-A). The integrated 12V DC MagLev fan reduces cooldown time and provides optimal airflow through the dust filtered optical tube. Engineered as a complete astroimaging system, every component of the RASA 11 V2 is optimized for peak performance with DSLR and astronomical CCD cameras. Down to the thickness of the glass used in the included fully-multicoated optical window or optional imaging filter, every component of the system has been taken into careful consideration to work together seamlessly. The Dovetail CGE bars on the top of the optical tube provides a connection for use of optional accessories like a guidescope.
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Ackermann, 1783-1983: The business of art
Vendor: Abebooks.com Price: 59.00 $A biography about Rudolph Ackermann and a history of his printing business. Numerous illustrations accompany the text. 256 pages. cloth, dust jacket. 4to..
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Ackermann Military Prints: Uniforms of the British and Indian Armies 1840-1855
Vendor: Abebooks.com Price: 44.05 $For many years the magnificent color prints published by the firm of Rudolf Ackermann during the 19th century have been in the possession of lucky collectors. However, with the passing of many years these frail works of art have become damaged, or have perished, so that many are not available to those who wish to find and appreciate the work and care which went into these productions.
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Ackermann's Repository Fashion Prints 1815-1818
Vendor: Abebooks.com Price: 67.11 $A Regency romance author compiled a comprehensive list of all the London fashion prints and commentary from all twenty years of Ackermann's Repository of arts, literature, commerce, manufactures, fashions, and politics, to which she added annual timelines of important historic events. While this volume was created for the use of authors of historical fiction, it may also appeal to anyone interested in historical women's fashion.This volume covers fashions and commentry from 1815-1818.
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Ackermann's Repository Fashion Prints 1815-1818
Vendor: Abebooks.com Price: 57.76 $A Regency romance author compiled a comprehensive list of all the London fashion prints and commentary from all twenty years of Ackermann's Repository of arts, literature, commerce, manufactures, fashions, and politics, to which she added annual timelines of important historic events. While this volume was created for the use of authors of historical fiction, it may also appeal to anyone interested in historical women's fashion.This volume covers fashions and commentry from 1815-1818.
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Rita Ackermann: Mama
Vendor: Abebooks.com Price: 80.38 $Grossformat Hardcover Leinen mit Schutzumschlag, ungebraucht, Auflage 2021. Sprache: Englisch
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Rita Ackermann [first edition]
Vendor: Abebooks.com Price: 325.00 $A native of Hungary, Rita Ackermann moved to New York City in the mid-1990s. She arrived to find a culture (and art world) in transition: rave and zine culture was in full swing; collaborations between artists, musicians, and magazine and book publishers were pervasive; and the dawning of the Internet age was upon us. Within a few short months after settling in New York, the artist received widespread attention for her work, particularly a group of canvases populated with figures inspired by the cult German film We Children from Bahnhof Zoo about the heroin subculture of the 1970s. Her work forged a new visual language: paintings, drawings, and collages which telescoped between a virtuoso—and sometimes brutalistic—expressionism and taut, precise figurative drawing. Ackermann’s work explores the paradoxical relationship between fragility and violence, as she derives inspiration from literature, film, philosophy, and popular culture.This lavishly illustrated volume—created in close collaboration with the artist—chronicles the entirety of her career. Bonnie Clearwater connects the artist to Eastern European art historical precedents and examines the evolution in her practice over the last twenty years. Felix Ensslin thoughtfully examines Ackermann’s work through a panoply of European theorists’ writings, from Jacques Derrida to Jacques Lacan. Harmony Korine (famed writer of Kids) contributes an imagined conversation with the artist. John Kelsey explores the artist’s use of collage and its meaning in her body of work, and Josh Smith contributes a foreword, in the form of a personal letter.
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Rita Ackermann [first edition]
Vendor: Abebooks.com Price: 450.00 $A native of Hungary, Rita Ackermann moved to New York City in the mid-1990s. She arrived to find a culture (and art world) in transition: rave and zine culture was in full swing; collaborations between artists, musicians, and magazine and book publishers were pervasive; and the dawning of the Internet age was upon us. Within a few short months after settling in New York, the artist received widespread attention for her work, particularly a group of canvases populated with figures inspired by the cult German film We Children from Bahnhof Zoo about the heroin subculture of the 1970s. Her work forged a new visual language: paintings, drawings, and collages which telescoped between a virtuoso—and sometimes brutalistic—expressionism and taut, precise figurative drawing. Ackermann’s work explores the paradoxical relationship between fragility and violence, as she derives inspiration from literature, film, philosophy, and popular culture.This lavishly illustrated volume—created in close collaboration with the artist—chronicles the entirety of her career. Bonnie Clearwater connects the artist to Eastern European art historical precedents and examines the evolution in her practice over the last twenty years. Felix Ensslin thoughtfully examines Ackermann’s work through a panoply of European theorists’ writings, from Jacques Derrida to Jacques Lacan. Harmony Korine (famed writer of Kids) contributes an imagined conversation with the artist. John Kelsey explores the artist’s use of collage and its meaning in her body of work, and Josh Smith contributes a foreword, in the form of a personal letter.
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Rita Ackermann: Hidden
Vendor: Abebooks.com Price: 34.06 $Book is in NEW condition. 1.85
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