326 products were found matching your search for F Ratio in 4 shops:

This is the FUJIFILM X-mount version of the 17-70mm F/2.8 Di III-A VC RXD (Model B070) released on January 14, 2021 for Sony E-mount APS-C mirrorless cameras. It features a maximum aperture of F2.8 across the entire 4.1x zoom ratio that covers the focal length range of 17-70mm (full-frame equivalent of 25.5-105mm), and superb optical performance. It is a small, lightweight lens that is equipped with VC (Vibration Compensation) mechanism to minimize camera shake.

This combination focal reducer and field corrector lens accessory works with all Celestron C5, C8, C9.25, C11 and C14 telescopes. This clever accessory makes it possible to have a dual focal ratio instrument, without sacrificing image quality. The Reducer/Corrector is f/6.3 for C5, C8, C9.25 and C11 telescopes and f/7 for the C14 telescope.If offers wide fields of view with any Schmidt-Cassegrain telescope. Used for astrophotography, it reduces exposure time by a factor of 3. Celestron doesn't offer a f/6.3 Schmidt-Cassegrain telescope, because the design is impractical, with a large central obstruction, and resulting loss in contrast. This, added to the inability to utilize longer focal ratios for certain objects, led Celestron to design the four-element, fully multicoated f/6.3 Reducer/Corrector. Results are amazing both visually and photographically.

William F Sharpe received the Nobel Prize in Economics in 1990 for his work on equilibrium pricing in capital markets. He was one of the originators of the Capital Asset Pricing Model, developed the Sharpe Ratio for investment performance analysis, the binomial method for the valuation of options, the gradient method for asset allocation optimization, and returns-based style analysis for evaluating the style and performance of investment funds. This book consists of a collection of Dr Sharpe's work in these and other areas.

When seeking superior projection quality, the Panasonic ET-ELW21 13.05mm f/2.0 Fixed Focus Lens is an excellent choice. With a 0.8:1 throw ratio, this lens is specifically engineered for use with a range of Panasonic projectors, including the PT-EZ570, PT-EZ570L, PT-EW630, PT-EW630L, PT-EX600, PT-EX600L, PT-EW530, PT-EW530L, PT-EX500, and PT-EX500L models. This fixed focus lens boasts a focal length of 13.05mm and an aperture of f/2.0, delivering sharp, clear images every time. It's particularly well-suited for rear projection setups, providing consistent, high-quality visuals for your presentations or home theater experiences. Incorporating the Panasonic ET-ELW21 13.05mm f/2.0 Fixed Focus Lens into your projection system ensures a seamless, high-definition viewing experience. Whether you're presenting in a business setting or enjoying a movie at home, this lens delivers top-notch performance and reliability.

Why settle for anything less than the Panasonic ET-ELW20 20.4-27.6mm f/1.8-2.3 Zoom Lens when you can enhance your visual presentations with its unparalleled versatility and performance? This high-quality zoom lens is meticulously engineered for compatibility with a range of Panasonic projectors, including the PT-EZ570, EZ570L, EW630, EW630L, EX600, EX600L, EW530, EW530L, EX500, and EX500L models.Crafted by Panasonic, a brand synonymous with innovation and reliability, the ET-ELW20 lens boasts a variable focal length of 20.4-27.6mm, allowing for a broad spectrum of framing possibilities. Its impressive f/1.8-2.3 aperture range ensures that your images are bright and clear, even in environments with challenging lighting conditions.The lens's 1.3-1.7:1 throw ratio is ideal for those seeking flexibility in projector placement relative to the screen, providing large, sharp images from a variety of distances. Whether you're projecting in a small meeting room or a large auditorium, this lens adapts to your spatial requirements without compromising on image quality.Durability is a cornerstone of the ET-ELW20 design, ensuring that it withstands the rigors of frequent use. This makes it a reliable choice for educational institutions, businesses, and professional event coordinators who demand equipment that performs consistently over time.Choose the Panasonic ET-ELW20 Zoom Lens for its wide-ranging focal lengths and robust construction, making it a versatile and indispensable tool for high-impact photography or videography. Elevate your visual storytelling with this innovative lens, designed to bring your projected images to life with stunning clarity and detail.

This is the FUJIFILM X-mount version of the 17-70mm F/2.8 Di III-A VC RXD (Model B070) released on January 14, 2021 for Sony E-mount APS-C mirrorless cameras. It features a maximum aperture of F2.8 across the entire 4.1x zoom ratio that covers the focal length range of 17-70mm (full-frame equivalent of 25.5-105mm), and superb optical performance. It is a small, lightweight lens that is equipped with VC (Vibration Compensation) mechanism to minimize camera shake.

This is the FUJIFILM X-mount version of the 17-70mm F/2.8 Di III-A VC RXD (Model B070) released on January 14, 2021 for Sony E-mount APS-C mirrorless cameras. It features a maximum aperture of F2.8 across the entire 4.1x zoom ratio that covers the focal length range of 17-70mm (full-frame equivalent of 25.5-105mm), and superb optical performance. It is a small, lightweight lens that is equipped with VC (Vibration Compensation) mechanism to minimize camera shake.

This is the FUJIFILM X-mount version of the 17-70mm F/2.8 Di III-A VC RXD (Model B070) released on January 14, 2021 for Sony E-mount APS-C mirrorless cameras. It features a maximum aperture of F2.8 across the entire 4.1x zoom ratio that covers the focal length range of 17-70mm (full-frame equivalent of 25.5-105mm), and superb optical performance. It is a small, lightweight lens that is equipped with VC (Vibration Compensation) mechanism to minimize camera shake.

This is the FUJIFILM X-mount version of the 17-70mm F/2.8 Di III-A VC RXD (Model B070) released on January 14, 2021 for Sony E-mount APS-C mirrorless cameras. It features a maximum aperture of F2.8 across the entire 4.1x zoom ratio that covers the focal length range of 17-70mm (full-frame equivalent of 25.5-105mm), and superb optical performance. It is a small, lightweight lens that is equipped with VC (Vibration Compensation) mechanism to minimize camera shake.

This is the FUJIFILM X-mount version of the 17-70mm F/2.8 Di III-A VC RXD (Model B070) released on January 14, 2021 for Sony E-mount APS-C mirrorless cameras. It features a maximum aperture of F2.8 across the entire 4.1x zoom ratio that covers the focal length range of 17-70mm (full-frame equivalent of 25.5-105mm), and superb optical performance. It is a small, lightweight lens that is equipped with VC (Vibration Compensation) mechanism to minimize camera shake.

This is the FUJIFILM X-mount version of the 17-70mm F/2.8 Di III-A VC RXD (Model B070) released on January 14, 2021 for Sony E-mount APS-C mirrorless cameras. It features a maximum aperture of F2.8 across the entire 4.1x zoom ratio that covers the focal length range of 17-70mm (full-frame equivalent of 25.5-105mm), and superb optical performance. It is a small, lightweight lens that is equipped with VC (Vibration Compensation) mechanism to minimize camera shake.

This is the FUJIFILM X-mount version of the 17-70mm F/2.8 Di III-A VC RXD (Model B070) released on January 14, 2021 for Sony E-mount APS-C mirrorless cameras. It features a maximum aperture of F2.8 across the entire 4.1x zoom ratio that covers the focal length range of 17-70mm (full-frame equivalent of 25.5-105mm), and superb optical performance. It is a small, lightweight lens that is equipped with VC (Vibration Compensation) mechanism to minimize camera shake.

This is the FUJIFILM X-mount version of the 17-70mm F/2.8 Di III-A VC RXD (Model B070) released on January 14, 2021 for Sony E-mount APS-C mirrorless cameras. It features a maximum aperture of F2.8 across the entire 4.1x zoom ratio that covers the focal length range of 17-70mm (full-frame equivalent of 25.5-105mm), and superb optical performance. It is a small, lightweight lens that is equipped with VC (Vibration Compensation) mechanism to minimize camera shake.

This is the FUJIFILM X-mount version of the 17-70mm F/2.8 Di III-A VC RXD (Model B070) released on January 14, 2021 for Sony E-mount APS-C mirrorless cameras. It features a maximum aperture of F2.8 across the entire 4.1x zoom ratio that covers the focal length range of 17-70mm (full-frame equivalent of 25.5-105mm), and superb optical performance. It is a small, lightweight lens that is equipped with VC (Vibration Compensation) mechanism to minimize camera shake.

This is the FUJIFILM X-mount version of the 17-70mm F/2.8 Di III-A VC RXD (Model B070) released on January 14, 2021 for Sony E-mount APS-C mirrorless cameras. It features a maximum aperture of F2.8 across the entire 4.1x zoom ratio that covers the focal length range of 17-70mm (full-frame equivalent of 25.5-105mm), and superb optical performance. It is a small, lightweight lens that is equipped with VC (Vibration Compensation) mechanism to minimize camera shake.

This is the FUJIFILM X-mount version of the 17-70mm F/2.8 Di III-A VC RXD (Model B070) released on January 14, 2021 for Sony E-mount APS-C mirrorless cameras. It features a maximum aperture of F2.8 across the entire 4.1x zoom ratio that covers the focal length range of 17-70mm (full-frame equivalent of 25.5-105mm), and superb optical performance. It is a small, lightweight lens that is equipped with VC (Vibration Compensation) mechanism to minimize camera shake.

This is the FUJIFILM X-mount version of the 17-70mm F/2.8 Di III-A VC RXD (Model B070) released on January 14, 2021 for Sony E-mount APS-C mirrorless cameras. It features a maximum aperture of F2.8 across the entire 4.1x zoom ratio that covers the focal length range of 17-70mm (full-frame equivalent of 25.5-105mm), and superb optical performance. It is a small, lightweight lens that is equipped with VC (Vibration Compensation) mechanism to minimize camera shake.