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2. Fisheye lens - Wikipedia

   en.wikipedia.org/wiki/Fisheye_lens

   In a circular fisheye lens, the image circle is inscribed in the film or sensor area; in a diagonal ("full-frame") fisheye lens, the image circle is circumscribed around the film or sensor area. This implies that using a fisheye lens for a different format than it was intended for is easy (as opposed to a rectilinear lens), and may change its ...

3. Sigma 4.5mm f/2.8 EX DC Circular Fisheye HSM lens - Wikipedia

   en.wikipedia.org/wiki/Sigma_4.5mm_f/2.8_EX_DC...

   It is a circular fisheye lens, designed to project a 180-degree field of view in all directions onto a circular image. It is the first such lens to provide the complete circular fisheye effect on crop factor digital SLR cameras, which do not have a full 36x24mm sensor. [1] This lens is available in Canon, Nikon, Sigma, Pentax and Sony mounts.

4. Samyang Optics - Wikipedia

   en.wikipedia.org/wiki/Samyang_Optics

   Samyang Optics is a South Korean manufacturer of camera lenses for several major brands of third-party mounts for still photography and video cameras.The company was founded in 1972 and has about 150 employees.

5. Ultra wide angle lens - Wikipedia

   en.wikipedia.org/wiki/Ultra_wide_angle_lens

   Leitz Elmarit R19/2.8 ultra wide angle lens for Leica R cameras Ihagee Exa camera with Carl Zeiss Jena Flektogon 1:4 20 mm super wide angle lens. An ultra wide-angle lens is a lens whose focal length is shorter than that of an average wide-angle lens, providing an even wider view. The term denotes a different range of lenses, relative to the ...

6. Peleng lens - Wikipedia

   en.wikipedia.org/wiki/Peleng_lens

   Peleng 3.5/8A is an 8 mm super-wideangle circular fisheye photographic lens, and is designed as an interchangeable lens for Canon, Nikon, Pentax, Olympus digital or film cameras which have or do not have the instant-return diaphragm automatic control device [clarification needed]. The lens has a variable diaphragm from f/3.5 to f/16.

7. Samyang 8mm f3.5 fisheye - Wikipedia

   en.wikipedia.org/wiki/Samyang_8mm_f3.5_fisheye

   The Samyang 8mm f/3.5 fisheye is a fisheye photographic lens using the stereographic projection and is designed for crop factor APS-C DSLRs. [1] It is made in South Korea by Samyang Optics and marketed under several brand names, including Rokinon. The lens uses manual focus only. For most versions of the lens, the aperture must be set manually.