Search
× Search
Canon Patent Application: DO Supertelephotos
CanonNews
/ 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 Canon Patent Application: Organic sensor
Print
blog comments powered by Disqus

Keep In Touch

FacebookTwitterLinkedIn

How to view Japan Patent applications.

Unfortunately, there's no direct way of linking to the patent application (sad!) however, this is the easiest process to view a japan patent or application.

  1. Go to the Japan Patent Office search page.
  2. If it's a patent application (they are usually in the format of Year-Number ie: 2017-011300) then type the patent application number into the second field down from the top where it says publication of patent application. 
  3. Click on search.
  4. Then click on the patent application number link, and there's the patent application!

Our Preferred 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© 2024 by CanonNews. This site is not affiliated with Canon Inc. or it's subsidiaries.
Back To Top