× Search


Canon Patent Application: DO Supertelephotos
/ 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: DO Supertelephotos

Another patent for diffractive optics (DO) super telephotos has appeared.  This seems to be a subject of ongoing R&D inside of Canon, with several patent applications listed for these lenses using diffractive optics.

There was a rumor about super telephotos for the RF mount using Diffractive Optics, perhaps this is related.  For supertelephoto lenses, the back focus is so large, that the lens could be made for just about any mount.

This patent application describes two lens embodiments, one for a 300mm 2.8 and another for a 400mm 2.8 DO supertelephoto.

Focal distance      392.58 
F number              2.91 
a half field angle    3.15 
Image height         21.64 

length of the lens  363.53 
BF                   59.15 

Focal distance      293.40 
F number              2.91 
a half field angle    4.22 
Image height         21.64 
length of the lens  274.00 
BF                   59.35

Japan Patent Application 2018-189878

Previous Article Canon Patent Application: Speedbooster adapter for EOS-M
Next Article PhotographyBlog: Canon RF 35mm 1.8 STM IS Macro Review
blog comments powered by Disqus

Keep In Touch


Our Sponsors

Want to buy me a coffee?

Free Shipping to the USA and Canada*

Use CANONNEWS for $10 off AuroraHDR

Use CANONNEWS for $10 off Luminar

*Conditions may apply


Terms Of UsePrivacy Statement© 2021 by CanonNews. This site is not affiliated with Canon Inc. or it's subsidiaries.
Back To Top