Richard CanonNews / Thursday, December 6, 2018 / 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: Canon EF-S 55-250mm While never as exciting as the latest full frame lens patent applications as we discover, the EF-S system (and closely followed by the EF-M system these days) is the backbone of Canons camera sales. Thus, while research and development happen on the more exciting areas, work still progresses on the more mundane, yet necessary lenses. This patent application discusses a lens that is compact, lightweight and highly corrected for axial and normal chromatic abberations. This lens has a long backfocus and a 13.66mm image radius (image height), so it's an EF-S APS-C lens. Focal distance 56.81 135.00 241.28 F number 4.03 5.11 5.88 Field angle 13.52 5.78 3.24 Image height 13.66 13.66 13.66 length of the lens 154.60 192.00 209.61 BF 38.74 60.94 75.27 Japan Patent Application 2018-194772 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 Print Please login or register to post comments.