Search results
Results from the WOW.Com Content Network
The Samyang 500mm F8.0 MC Mirror is a supertelephoto lens and is designed for full frame DSLRs. [1] It is a mirror lens. The lens is made in South Korea by Samyang Optics and marketed under several brand names, including Rokinon and Walimex. The lens uses manual focus only. As all mirror lenses, it cannot change the aperture.
The infinity mirror (also sometimes called an infinite mirror) is a configuration of two or more parallel or angled mirrors, which are arranged to create a series of smaller and smaller reflections that appear to recede to infinity. [1] [2] Often the front mirror of an infinity mirror is half-silvered (a so-called one way mirror), but this is ...
[1] [2] These sights work on the simple optical principle that anything at the focus of a lens or curved mirror (such as an illuminated reticle) will appear to be sitting in front of the viewer at infinity. Reflector sights employ some form of "reflector" to allow the viewer to see the infinity image and the field of view at the same time ...
Nikon (under the Mirror-Nikkor and later Reflex-Nikkor names) and Canon both offered several designs, such as 500 mm 1:8 and 1000 mm 1:11. Smaller companies such as Tamron , Samyang , Vivitar , and Opteka also offered several versions, with the three latter of these brands still actively producing a number of catadioptric lenses for use in ...
Get a new pair of glasses as low as $26 at GlassesUSA during Black Friday week. Shop high-end brands like Ray-Ban or more affordable brands—they're all on sale.
(In the case of a lens with distortion, e.g., a fisheye lens, a longer lens with distortion can have a wider angle of view than a shorter lens with low distortion) [3] Angle of view may be measured horizontally (from the left to right edge of the frame), vertically (from the top to bottom of the frame), or diagonally (from one corner of the ...
Main page; Contents; Current events; Random article; About Wikipedia; Contact us; Donate
The Sigma 50-500mm f / 4-6.3 EX DG HSM is a super-telephoto zoom lens produced by Sigma Corporation. It contains four SLD (Special Low Dispersion) glass elements to provide correction for chromatic aberration. It is aimed at advanced consumers.