Search
× Search
Canon Patent Application: High Zoom Ratio lenses for EF and RF
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: High Zoom Ratio lenses for EF and RF

This patent application contains embodiments for high zoom ratio lenses.  Most of them are for EF mount, with large registration distances that are associated with the EF mount.  However, there is two RF mount lens embodiments that slips in with 22.42 and 21.75mm back focus.

Focal distance      35.04 152.85 350.37 
F number             3.50   4.97   5.60 
Field angle         30.36   8.05   3.53 
Image height        20.53  21.61  21.61 
length of the lens 321.17 321.17 321.17 
BF                  40.10  40.10  40.10 

Focal distance      35.04 152.85 350.37 
F number             3.50   4.97   5.60 
Field angle         30.36   8.05   3.53 
Image height        20.53  21.61  21.61 
length of the lens 321.17 321.17 321.17 
BF                  40.10  40.10  40.10 

Focal distance      35.13 160.38 386.45 
F number             4.50   5.27   5.60 
Field angle         30.30   7.67   3.20 
Image height        20.53  21.61  21.61 
length of the lens 362.82 362.82 362.82 
BF                  54.68  54.68 54.68 

Focal distance      29.22 203.97 350.06 
F number             2.80   4.36   4.50 
Field angle         32.15   6.05   3.53 
Image height        18.36  21.61  21.61 
length of the lens 406.68 406.68 406.68 
BF                  22.42  22.42  22.42 

Focal distance      25.20 125.05 294.41 
F number             3.50   4.97   5.60 
Field angle         36.72   9.80   4.20 
Image height        18.80  21.61  21.61 
length of the lens 374.08 374.08 374.08 
BF                  21.75  21.75  21.75 

Japan Patent Application 2018-180203

 

Previous Article Canon Patent Application: EF-M 32mm 1.4
Next Article Canon Patent Application: Irradiated Resin optical element
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© 2020 by CanonNews. This site is not affiliated with Canon Inc. or it's subsidiaries.
Back To Top