× Search


Canon Patent Application: Some odd DO telephotos
/ 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: Some odd DO telephotos

These have to be some of the strangest lens designs I've seen.  These are obviously experimental in nature.  But they are some very simplistic (and very slow) supertelephoto lenses using DO elements.

They are looking for in this patent application; 

 a good balance between reduction of change of the optical performance caused by an object distance and downsizing and weight reduction of the optical system.

The lens characteristics are;

Focal Length 780.00
F-Number 11.00
Half Field Angle 1.59 (.degree.)
Image Height 21.64
Total Length of 389.25
Lens BF 127.73

Focal Length 585.00
F-Number 10.99
Half Field Angle 2.12 (.degree.)
Image Height 21.64
Total Length of 334.87
Lens BF 134.40 

Focal Length 390.00
F-Number 8.20
Half Field Angle 3.18 (.degree.)
Image Height 21.64
Total Length of 250.00
Lens BF 92.99

US Patent Application 20190346660


Previous Article Canon lagging in mirrorless sales
Next Article Canon Patent Application: Some eye watering fast primes for the RF mount
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© 2022 by CanonNews. This site is not affiliated with Canon Inc. or it's subsidiaries.
Back To Top