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2. Sigma 50-500mm f/4-6.3 DG lens - Wikipedia

   en.wikipedia.org/wiki/Sigma_50-500mm_f/4-6.3_DG_lens

   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.

3. Sigma 150-600mm f/5-6.3 DG OS HSM lens - Wikipedia

   en.wikipedia.org/wiki/Sigma_150-600mm_f/5-6.3_DG...

   The Sigma APO 150-600mm F5-6.3 DG OS HSM lens is a super-telephoto lens produced by Sigma Corporation. It is actually a range of two slightly different lenses based on a common design: the Sports and Contemporary. Both lenses feature similar specifications, but there are some notable differences.

4. Sigma 150-500mm f/5-6.3 DG OS HSM lens - Wikipedia

   en.wikipedia.org/wiki/Sigma_150-500mm_f/5-6.3_DG...

   The Sigma APO 150-500mm F5-6.3 DG OS HSM lens is a super-telephoto lens produced by Sigma Corporation. It contains three SLD (Special Low Dispersion) glass elements to provide correction for chromatic aberration. It is aimed toward advanced consumer level photographers, and is available in Nikon, Canon, Pentax and Sigma camera mounts.

5. Nikon Z-mount - Wikipedia

   en.wikipedia.org/wiki/Nikon_Z-mount

   The TTArtisan M-Z 6-Bit adapter doesn't provide autofocus, but has a reader for Leica's 6-bit lens codes. This makes 6-bit coded lenses behave like Ai-P lenses on the FTZ, except with no aperture control (as rangefinder lenses use pre-set apertures): EXIF data is automatically recorded, IBIS is set to the correct focal length and focus ...

6. Pancake lens - Wikipedia

   en.wikipedia.org/wiki/Pancake_lens

   A body-cap lens is an extreme type of pancake lens that is designed to both protect the camera internals as a body cap normally would, yet still allow the user to take photos. These lenses are manual focus only and generally have no more than a couple of optical lens elements, no image correcting elements, a very-slow fixed aperture, an ...

7. Photographic lens design - Wikipedia

   en.wikipedia.org/wiki/Photographic_lens_design

   As diffraction is based on aperture width in absolute terms rather than the f-stop ratio, lenses for very small formats common in compact cameras rarely go above f/11 (1/1.8") or f/8 (1/2.5"), while lenses for medium- and large-format provide f/64 or f/128. Very-large-aperture lenses designed to be useful in very low light conditions with ...