× Search


Canon Patent Application: Dual teleconvertor telephoto
/ 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: Dual teleconvertor telephoto

This patent application is certainly novel.  Taking a page from the Canon 200-400 1.4x telephoto, this telephoto prime (using what seems to be in this patent application to be a rather simplistic design) has the added ability to add not one, but two different teleconverters into the light path.

While this may be far fetched it seems, it should be noted that this gets built in top of a 400 / 5.6 a very reasonable lens and one in which people have been clamoring for replacement.

What is interesting about this, is that one of the teleconverters, is a focal reducer, taking the telephoto down to a 300/4.0, so you basically have three telephoto lenses in one lens body; 300/4, 400/5.6 and a 600/8 mm lens.  This could be a very sweet lens if it makes it into production.

Nominal lens:

focal length 391.89 
F-number 5.80 
view angle 3.16 
Image height 21.64 
total lens length 299.31 
BF 167.00 

With teleconvertor (B)

Focal length 560.02   
F number 8.29   
angle of view 2.21   
image height 21.64   
lens total length 299.31   
BF 46.56 

With Teleconvertor (C)

focal length 286.00   
F-number 4.23   
view angle 4.33   
Image height 21.64   
total lens length 299.30   
BF 110.04   

Japan Patent Application 2019-70689

Previous Article Canon Patent Application: Telescoping EVF
Next Article AT-3565 Aluminum Tripod and BZ-217T Triple-Action Ball Head
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