Search
× Search
Canon Patent Application: Underwater RF Super-35 CINI Lenses
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: Underwater RF Super-35 CINI Lenses

In this patent application, Canon describes some very complex zoom lenses in the embodiments.  The actual patent application is for underwater photography.  It's an optical convertor that is attached to the front of the lens to compensate for the difference in refraction between saltwater and air.  The lenses of course are designed for use in air and when used underwater, the difference of refraction can cause aberrations. 

Looking at the above image, the optical converter is section ld and lf of the diagram.  The actual lens is the section (lm).  While the convertor is interesting and has a wide range of applications for underwater photography, I'm more curious about the lenses. 

The lenses are definitely cinema and super-35, as they have a 15.55mm image height which is larger than APS-C and less than full frame.  Another clue that it's for cinema purposes is the massive amount of optical elements in the lens design.  These aren't your garden variety APS-C cropped lenses here.

Keep in mind that this patent application would work regardless of the lens design but the inclusion of these complex cinema optical designs is curious.

Canon RF Cinema 13-90mm F2.8-4

focal length        13.15   38.61   93.99
F number              2.8    2.9     4.12
Half angle of view  49.79   21.94    9.39
Image height        15.55   15.55   15.55
Lens total length  423.63  423.63  423.63
BF                  20.64   20.64   20.64

Canon RF Cinema 14-100mm F2.8-3.6

focus Distance      14.06   41.36   99.33
F number             2.80    2.80    3.61
Half angle          47.87   20.61    8.90
Image height        15.55   15.55   15.55
Lens total length  390.30  390.32  390.41
BF                  39.99   40.00   40.09

Canon RF Cinema 15-105mm F2.8-4.0

focal length        14.98   44.10  105.46
F number             2.80    2.83    3.92
Half angle of view  46.07   19.42    8.39
Image High          15.55   15.55   15.55
Lens total length  402.64  402.62  402.27
BF                  17.81   17.94   17.60

Canon RF Cinema 12-90mm F2.8-4.0

focal distance      12.56   36.94   88.56
F number             2.80    2.84    3.95
Half angle          51.08   22.83    9.96
Image height        15.55   15.55   15.55
Lens total length  420.28  420.29  420.16
BF                  18.78   18.89   18.76

Japan Patent Application 2022-024363

Previous Article Canon Patent Application: Hybrid Rangefinder Viewfinder
Next Article Canon Patent Application: Shutter that minimizes shutter shock
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© 2022 by CanonNews. This site is not affiliated with Canon Inc. or it's subsidiaries.
Back To Top