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Celestron was the first large scale commercial manufacturer of the Schmidt-Cassegrain telescope, introducing its "C8" 8" diameter 2032 mm focal length, ƒ10 telescope in 1970. [7] The primary innovation Celestron/Tom Johnson devised was a method to produce Schmidt corrector plates using a vacuum to pull the glass blanks into a pre-shaped curve ...
The AF-S DX Zoom-Nikkor 10-24mm f /3.5–4.5 G ED is a lens manufactured by Nikon for use on Nikon DX format digital SLR cameras. It provides an angle of view on a DX format camera similar to that of a 15-36mm lens on a 135 film format camera.
Nikon announced the lens on 22 July 2003. [2] It was the first prime lens released by Nikon specifically designed for Nikon DX format DSLR cameras. The lens produces a distinctive rectangular fisheye image, which fills the DX format frame (as opposed to a circular fisheye lens which produces a circular image).
The 55-200mm AF-S lens is a medium telephoto zoom lens manufactured by Nikon for use on Nikon DX format digital SLR cameras. It comes in three variants: AF-S DX Zoom-Nikkor 55-200mm f /4–5.6 G ED, released in 2005 [1] AF-S DX Zoom-Nikkor 55-200mm f /4–5.6 G VR IF-ED, released in 2007, adds internal focusing (IF) and, most notably, vibration ...
Like all lenses in the DX format, the 18-55mm casts a smaller image circle than lenses for full-frame 35mm cameras and is therefore only compatible with cameras having APS-C-sized sensors (or vignetting will happen). However, from 24mm onward until 55mm, the image circle will cover the full 35mm frame, and is usable on film.
The AF-S DX Zoom-Nikkor 18-70mm f /3.5–4.5 G ED-IF is an F-mount zoom lens manufactured and sold by Nikon. Designed exclusively for use on Nikon DX format cameras, this lens covers from wide-angle to medium-telephoto range. This lens was announced in January 2004 [2] and was initially available as kit lens for the then-new Nikon D70. Later ...
However, they have been available for amateur motion picture, video and still cameras since the 1950s. [1]: 182–183 Before the zoom lens, afocal attachments were a way to provide a cheap sort of interchangeable lens system to an otherwise fixed lens camera. In the zoom lens era, they are a cheap way to extend the reach of a zoom.
The quality the codec can achieve is heavily based on the compression format the codec uses. A codec is not a format, and there may be multiple codecs that implement the same compression specification – for example, MPEG-1 codecs typically do not achieve quality/size ratio comparable to codecs that implement the more modern H.264 specification.
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