Richard CanonNews / Thursday, November 14, 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: Some odd DO telephotos These have to be some of the strangest lens designs I've seen. These are obviously experimental in nature. But they are some very simplistic (and very slow) supertelephoto lenses using DO elements. They are looking for in this patent application; a good balance between reduction of change of the optical performance caused by an object distance and downsizing and weight reduction of the optical system. The lens characteristics are; Focal Length 780.00 F-Number 11.00 Half Field Angle 1.59 (.degree.) Image Height 21.64 Total Length of 389.25 Lens BF 127.73 Focal Length 585.00 F-Number 10.99 Half Field Angle 2.12 (.degree.) Image Height 21.64 Total Length of 334.87 Lens BF 134.40 Focal Length 390.00 F-Number 8.20 Half Field Angle 3.18 (.degree.) Image Height 21.64 Total Length of 250.00 Lens BF 92.99 US Patent Application 20190346660 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: Stacked sensor and method of manufacturing Next Article Canon Patent Application: Some eye watering fast primes for the RF mount Print Tags: Canon Patent Application Please login or register to post comments.