Richard CanonNews / Wednesday, November 15, 2017 / 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. Another super-telephoto diffractive optic patent This patent deals with joining an aspherical element with a DO element group. In this patent is listed embodiments for a 300 2.8 IS DO and another 400 4.0 IS DO. Canon continues to work on improving the diffractive optical super telephotos, and maybe just maybe we'll see a 300mm DO similar to what Nikon has come out with. Read more US Patent Application 20170168269 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 E-Photozine: TS-E 50mm Macro Tilt-Shift Review Next Article New flash rumored aimed at small cameras and mirrorless Print Please login or register to post comments.