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2. Canon EF 8-15mm lens - Wikipedia

   en.wikipedia.org/wiki/Canon_EF_8-15mm_lens

   Canon EF 8-15mm lens. The EF8–15mm f/4L FISHEYE USM is a fisheye zoom lens for Canon digital single-lens reflex cameras (DSLRs) with an EF lens mount. It delivers 180° diagonal angle of view images for all EOS SLR cameras with imaging formats ranging from full-frame to APS-C, and provides 180° circular fisheye images for full-frame EOS models.

3. Fisheye lens - Wikipedia

   en.wikipedia.org/wiki/Fisheye_lens

   Canon 5.2 mm f/2.8 RF L [70] (a 190° stereographic fisheye with two fisheye lens systems: for 3D virtual reality shooting onto a single 35 mm full-frame image sensor, and less relevant for photography: fitting two image circles onto one frame of 36 mm width means that each can only be 18 mm in diameter, wasting quite a bit of resolution)

4. Canon EF 15mm lens - Wikipedia

   en.wikipedia.org/wiki/Canon_EF_15mm_lens

   The Canon EF 15mm f / 2.8 was a fisheye lens produced by Canon from 1987 to 2011. The lens was compatible with all EF camera bodies but only intended for full-frame configurations, as the fisheye effect is much less pronounced with a cropped sensor . In 2010 Canon announced the EF 8–15mm f / 4L Fisheye USM which replaced the EF 15mm f / 2.8. [2]

5. History of photographic lens design - Wikipedia

   en.wikipedia.org/wiki/History_of_photographic...

   A fisheye lens is a special type of ultra-wide angle retrofocus lens with little or no attempt to correct for rectilinear distortion. Most fisheyes produce a circular image with a 180° field of view. The term fisheye comes from the supposition that a fish looking up at the sky would see in the same way. [1]: 145

6. 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...

   Retail info. MSRP. $1400 USD. The Sigma 4.5mm f/2.8 EX DC circular fisheye is a photographic lens manufactured by Sigma Corporation. 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 ...

7. Canon EF camera - Wikipedia

   en.wikipedia.org/wiki/Canon_EF_camera

   Canon EF camera. The Canon EF is a manual focus 35mm single-lens reflex camera produced by Canon between 1973 and 1978. It was compatible with Canon's FD-mount lenses. The EF was built as an electro-mechanical version of Canon's top-of-the line wholly mechanical Canon F-1. The shutter is mechanical at all speeds ½ second and faster, but at 1 ...