Richard CanonNews / Thursday, February 21, 2019 / Categories: Canon Patents This post may contain affiliate links(s). An affiliate link means I may earn advertising/referral fees if you make a purchase through my link, without any additional cost to you. It helps to keep this site afloat. Thank you in advance for your support. If you like what we do here, maybe buy me a coffee. Canon Patent Application: Another patent for the Canon RF 70-300 Here is yet another patent application discussing the Canon RF 70-300.It's certainly a very strong possibility that we will see a consumer 70-300 the same as we have such a lens for the EF mount, and it appears that Canon is looking at developing such a lens with a short backfocus, something you would not normally see in a telephoto lens.focal length 71.53 132.28 293.70 F-number 4.16 5.18 5.83 half-field angle (degree) 16.83 9.29 4.21 Image height 21.64 21.64 21.64 Lens total length 179.52 216.99 250.81 BF 48.94 22.62 18.05 Japan Patent Application 2019028212 Richard CanonNewsRichard CanonNews Richard has been using Canon cameras since the 1990s, with his first being the now legendary EOS-3. Since then, Richard has continued to use Canon cameras and now focuses mostly on infrared photography. Richard is the founder and editor of CanonNews since 2017, and has worked as a writer on CanonRumors and other websites in the past. Other posts by Richard CanonNews Contact author Facebook page Previous Article Canon Patent Application: APS-C mirrorless kit lenses Next Article Canon Patent Application: Super Telephoto primes Print Tags: Canon Patent ApplicationCanon RF 70-300 Please login or register to post comments.