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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.

With the Large SCT & EdgeHD Adapter V2 for Off-Axis Guider, enhance your astrophotography experience by producing a larger area of illumination for your 9.25", 11", or 14" Schmidt-Cassegrain or EdgeHD telescope. This durable, high-quality adapter, designed by the reputable brand Celestron, is a versatile addition to your astrophotography equipment. When paired with an Off-Axis Guider, this compact, user-friendly adapter allows you to utilize the full image circle in larger scopes. This feature is particularly beneficial for owners of larger format cameras, such as the Canon 5D or 6D, as their full frame can fully leverage the increased area of illumination produced by larger optical tubes. The Large SCT & EdgeHD Adapter V2 for Off-Axis Guider boasts a longer optical length of 38mm. This extended length provides DSLR cameras with the necessary back-focus spacing for Schmidt-Cassegrain and EdgeHD optical tubes when used in conjunction with the Off-Axis Guider, eliminating the need for additional adapters or spacers. Crafted from machined aluminum with a black anodized finish, the Large SCT & EdgeHD Adapter V2 for Off-Axis Guider is built to last. Its internal surfaces are sandblasted to prevent glare and ensure the highest contrast, enhancing your astrophotography results. The adapter also features a knurled surface, providing a superior grip for easy threading and unthreading. Experience the convenience and quality of this specialized astrophotography accessory.

Western Tradition: From the Ancient World to Louis XIV v. 1 (College) by Weber, Eugen Joseph(June 1, 1972) Paperback

Communicating Globally: Intercultural Communication and International Business uniquely integrates the theory and skills of intercultural communication with the practices of multinational organizations and international business. Authors Wallace V. Schmidt, Roger N. Conaway, Susan S. Easton, and William J. Wardrope provide students with a cultural general awareness of diverse world views, valuable insights on understanding and overcoming cultural differences, and a clear path to international business success.

XXIV,356 S., Ppbd. - Städteforschung, Reihe A;47 - Mit Beiträgen v. Heinrich Schmidt, Klaus Wriedt, Irene Stahl, Klaus Arnold, Wilfried Reininghaus u.a.