Richard CanonNews / Friday, September 21, 2018 / Categories: Canon Patents Canon Patent Application: 600mm F4 DO Supertelephoto Canon has applied for another patent application dealing with diffractive optics. This patent application is for a 600 F4 Supertelephoto diffractive optics lens. This appear to be EF lens designs, and not RF, as the back focus is larger than 44mm. However, for super-telephotos, either mount could be used as the final lens design. Canon has shown off a prototype of the 600mm DO Supertelephoto for years now, sooner or later it's bound to show up. Focal length 585 F-Number 4.12 Half angle of view 2.12 Image height 26.4 BF 70.86 US Patent Application 20180259690 Previous Article Canon officially announces the SX70 HS Next Article Tokina announces the Opera 50mm 1.4 for Canon EF Print 4589 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