Canon Patents

Patent: Canon EF 10mm f/2.8L USM

This site contains affiliate links to products and services. We may receive a commission for purchases made through these links.

A patent application showing the optical formula for an EF 10mm f/2.8 prime lens has been filed in Japan.

Japan Patent Application 2018-233223:

  • Focal length: 10.30mm
  • F number: 2.88
  • The half angle of view: 64.54°
  • Image height: 21.64mm
  • Lens length: 124.58mm
  • Back focus: 38.00mm

It looks like this patent may have been a part of the EF 11-24mm f/4L USM development.

Tom W

EOS R5
Sep 5, 2012
322
303
This would be a focal length where the RF mount would shine - I hope Canon does come up with something ultra-short, but in a design that takes advantage of the short flange distance of the R series.
 
  • Like
Reactions: 1 users

Del Paso

M3 Singlestroke
CR Pro
Aug 9, 2018
1,727
1,993
This would be a focal length where the RF mount would shine - I hope Canon does come up with something ultra-short, but in a design that takes advantage of the short flange distance of the R series.
+ 1
 

flip314

EOS RP
Sep 26, 2018
280
420
Holy balls that's a crazy lens for FF... I can't even take good photos with my 10-18 EF-S, haha
 

Kit.

EOS 5D Mark IV
Apr 25, 2011
2,232
1,542
This would be a focal length where the RF mount would shine - I hope Canon does come up with something ultra-short, but in a design that takes advantage of the short flange distance of the R series.
But this one could be used with the ND filter adapter.
 
  • Like
Reactions: 3 users

padam

EOS R
Aug 26, 2015
1,274
930
Looks like they've refined it a little bit compared to 2015
 
  • Like
Reactions: 1 user

GMCPhotographics

EOS 5D Mark IV
CR Pro
Aug 22, 2010
1,714
437
51
Uk
www.GMCPhotographics.co.uk
This would be a focal length where the RF mount would shine - I hope Canon does come up with something ultra-short, but in a design that takes advantage of the short flange distance of the R series.
But it also goes to reinforce the fact that Canon are still progressing with ef lenses....it's not an Rf revolution....but the two formats living alongside each other. I think i would prefer a 10mm f2.8 prime than a 11-24mm f4 zoom. Especially if it was substantially smaller and lighter.
 
  • Like
Reactions: 1 users

padam

EOS R
Aug 26, 2015
1,274
930
But it also goes to reinforce the fact that Canon are still progressing with ef lenses....it's not an Rf revolution....but the two formats living alongside each other. I think i would prefer a 10mm f2.8 prime than a 11-24mm f4 zoom. Especially if it was substantially smaller and lighter.
If anything, the front lens looks even a bit bigger on this one, probably not too different in terms of size or weight, it lets in twice as much as light after all with an even wider field-of-view. With the possibility of using a big rear element and bending light rays differently, a substantial reduction in size can be achieved with the RF mount.
 

Antono Refa

EOS R
Mar 26, 2014
1,403
502
But it also goes to reinforce the fact that Canon are still progressing with ef lenses.

I doubt we'll ever see this lens. When Canon decides to make a lens, we sometimes see the lens before the patent, not three years after.

My guess is Canon looked at the sales of the Voighlander 10mm for Sony E mount, and possibly the EF 11-24mm, decided there's no profit in a 10mm prime, and left it on the shelf.
 

GMCPhotographics

EOS 5D Mark IV
CR Pro
Aug 22, 2010
1,714
437
51
Uk
www.GMCPhotographics.co.uk
If anything, the front lens looks even a bit bigger on this one, probably not too different in terms of size or weight, it lets in twice as much as light after all with an even wider field-of-view. With the possibility of using a big rear element and bending light rays differently, a substantial reduction in size can be achieved with the RF mount.
Here comes the usual Rf mantra and regurgitation of recently learned information....done a lot of lens design have you? This patent is for an EF lens not an Rf lens. It is an indication that Canon are sill designing and applying for patents for their EF lens designs. It means that they are still applying R&D budget to the EF format. If Canon feels that they have developed something new...they will protect their "device" by applying for a patent.
 

Mistral75

EOS 90D
Oct 13, 2013
112
62
Paris, France
It looks like this patent may have been a part of the EF 11-24mm f/4L USM development.

It's more than that, it is the patent of the optical formula of the EF 11-24mm f/4L USM.

Example 1 of the patent:

183497

Canon EF 11-24mm f/4L USM:

183496

You really don't under stand what a patent is do you....patents always come first. Production never comes before a patent.

Ahem!... See above.
 
  • Like
Reactions: 1 user

neuroanatomist

I post too Much on Here!!
CR Pro
Jul 21, 2010
27,282
6,845
You really don't under stand what a patent is do you....patents always come first. Production never comes before a patent.
You really don’t understand how a patent works, do you? A patent will be filed before a product is launched, but the patent doesn’t publish until 18 months after it is filed.
 
  • Like
Reactions: 2 users

padam

EOS R
Aug 26, 2015
1,274
930
Here comes the usual Rf mantra and regurgitation of recently learned information....done a lot of lens design have you? This patent is for an EF lens not an Rf lens. It is an indication that Canon are sill designing and applying for patents for their EF lens designs. It means that they are still applying R&D budget to the EF format. If Canon feels that they have developed something new...they will protect their "device" by applying for a patent.
You've made a rubbish remark about wishing it was be smaller and lighter without looking at what it actually is, I responded that if that is what you wish, it probably makes more sense for them to shrink it for the RF mount since it has its advantages, but whatever, I am sure they will make it just for you ;)