Canon Patent Application: Lenses with Optical Distortion Correction

[Richard CN]

This is an interesting patent application (2025-012993) showing a strange lens configuration.


The embodiments show a potential RF fish eye zoom, even though that is not the focus of the patent application.

Canon Patent Application: Lenses with Optical Distortion Correction - Canon Rumors

This is an interesting patent application (2025-012993) showing a strange lens configuration. The embodiments show a potential RF fish eye zoom, even though that is not the focus of the patent application. By inserting a lens grouping identified as (LC) into the lens, Canon is able to reduce the...

www.canonrumors.com

 

[cpreston]

From the title, I thought Canon might have designed some sort of fixed focal length lens that zooms from fisheye to rectilinear. I would buy that in a heartbeat. It would be so much fun for video.

What you’ve actually described seems pointless.

 

[neuroanatomist]

From the title, I thought Canon might have designed some sort of fixed focal length lens that zooms from fisheye to rectilinear.

That's actually how I read it: "...method of converting a projection method of a fisheye lens into a general projection method by arranging an aspheric dome-shaped lens having a negative refractive power on the object side of the fisheye lens." Like the flip-in TC on the 200-400/4 + 1.4x, but you flip in a group behind the 8-14mm fisheye that converts it to a 15mm rectilinear lens.

 

[GMCPhotographics]

It's certainly interesting prospect. The EF 8-15mm L f4 fisheye is a great and small lens that sits easy in a travel bag and can go wider than anything else. I've been a bif fan of this lens since it's launch and it's easily the most versatile fisheye lens ever made. Sometimes I de-fish the images in lightroom for good effect and I get images that are wider in perspective than my EF 11-24mm. Sure the corners are stretchy and mush....but as an occasional (and light weight) lens it's verry useful.
Addding a drop in element that allows this sweet little lens to become a 16mm rectilinear prime really adds a lot more to it's versatility.