Search
× Search

News

Canon Patent Application: 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: Supertelephotos

Because of the nature of Canon's extenders, usually, it's impossible to tell if a super-telephoto design was intended for DSLR's or mirrorless cameras.  Some designs we have seen were most definitely mirrorless, with the backfocus exceedingly shorter than that possible for DSLR's - however now that we know that the extenders ingress into the lens, those designs have little hope of becoming reality.  The backfocus of a super telephoto has to be at least 38mm (the sensor to the lens mount distance 22mm ) + ~16mm (the distance the converters ingress into the lens itself).  For a DSLR design, the backfocus has to be at least 44mm + 10-15mm for the convertor.

This patent application contains the full suite of super telephotos including the F200/2.0 which usually never shows up in these applications.  The F200 F2.0 gives us a clue about the intention of this application since the backfocus of the 200mm F2.0 is 38mm.  Because of this, we can assume that at least the F200 and possibly the application itself was done with the intention of the EOS R system.

Canon's goal with this patent application is;

The present invention is lightweight, and aberrations such as chromatic aberration and has an object to provide a well-corrected optical system and an image pickup apparatus having the same.

The embodiments are shown below.

Canon 600mm F4.0

Focal length        585.00
F number              4.12
Half angle of view    2.12
Image height         21.64
Lens total length   475.00 
BF                  103.93

Canon 400mm F2.8

Focal length        392.57
F number              2.90
Half angle            3.15
Image height         21.64
Lens total length   371.15
BF                   75.00

Canon 500mm F4.0

focal length        489.05
F-number              4.12
Half angle of view    2.53
Image height         21.64
Lens overall length 411.08
BF                  100.00

Canon 800mm F5.6

focal length        777.00
F-number              5.80
half angle            1.59
Image height         21.64
total lens length   498.01
BF                  158.67

Canon 300mm F2.8

Focal length        292.53
F number              2.90
Half angle of view    4.23
Image height         21.64
Lens overall length 273.92
BF                   76.35

Canon RF 200mm F2.0

focal length        200.00
F number              2.06
Half angle            6.17
Image height         21.64
Lens total length   196.01
BF                   38.50

Japan Patent Application 2021-039379

Previous Article New Rumor: The R1 will be everything you dreamed of and more
Next Article Canon Patent Application: Canon RF 100mm F2.0 and other primes
Print
blog comments powered by Disqus

Keep In Touch

FacebookTwitterLinkedIn

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