Richard CanonNews / Thursday, December 6, 2018 / Categories: Canon Patents 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 Previous Article Canon Patent Application: Organic sensor Next Article Canon Patent Application: TS-E or medium format lenses Print 4795 Leave a comment Name: Please enter a name. Email: Please enter an email address. Please enter a valid email address. Comment: Please enter comment. I agree This form collects your name, email, IP address and content so that we can keep track of the comments placed on the website. For more info check our Privacy Policy and Terms Of Use where you will get more info on where, how and why we store your data. You must read and accept this rules. Add comment