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Is Canon Developing an 8mm f/4 Circular Fisheye for the RF Mount?
By Ian Bongso-Seldrup, April 9, 2020 @ 09:00 PM (EST)
Source: PetaPixel

Underwater shooters who have taken the plunge into Canon’s new full-frame mirrorless world with the EOS R or EOS RP don’t have many RF-mount lenses to choose from—so far they’re overwhelming more suitable for topside use. But now, there might just be an R-system lens in the works to get excited about: an 8mm f/4!

According to Canon News, the Japanese brand has made a local patent application for a circular fisheye lens with a field of view of nearly 182°—so wide that it can actually see behind itself! The document indicates that the lens would produce a 23 x 23mm image circle, which would allow the full-frame sensor (size: 35mm x 24mm) to capture the full circle. Check out the schematic diagram accompanying the patent application (above)—how chunky is that front element?

Admittedly, such an extreme lens likely won’t emerge before Canon has released plenty of more-mainstream lenses for the RF-mount. Still, if it ever sees the light of day, it will surely be a fun lens to play with underwater. Until then, Canon full-frame mirrorless users will have to slap on an EF-to-RF adapter and get creative with the good old EF 8–15mm f/4L Fisheye.
 



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