Canon Patents

Patent: Optical formulas for an RF 28mm f/1.4 and RF 35mm f/1.4

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Canon Inc. has filed a patent application for more optical formulas of fast RF prime lenses, this time an RF 28mm f/1.4L USM and an RF 35mm f/1.4L USM.

There have been many patents in the past for these optical formulas, but our roadmap shows an RF 35mm f/1.2L USM and I haven’t yet been told that an RF 28mm f/1.4L USM was on the way.

Canon RF 28mm f/1.4L USM

Focal length: 26.79mm
F-number: 1.44
Half angle of view: 38.93°
Image height: 21.64mm
Lens overall length: 134.78mm
Backfocus: 13.00mm

Canon RF 35mm f/1.4L USM

Focal length: 33.73mm
F-number: 1.44
Half angle of view: 32.68°
Image height: 21.64mm
Lens overall length: 143.92mm
Backfocus: 20.00mm

aceflibble

EOS RP
May 8, 2015
350
177
I remember years ago when they patented an EF 28mm f/1.4L alongside the 24mm and 35mm f/1.4, and then a second time when they patented another one with the 24mm and 35mm mark IIs. Obviously, neither ever came. I'm not going to get my hopes up this time, either. Like how Canon have decided for us that 100mm is only for macro (it isn't) and only 85s are allowed fast apertures, I get the feeling they've also decided we don't really want 28mm (we do) and are only filing these patents to cover their backs.

A weather-sealed 28mm & 100mm at f/2 or faster, in a size that is actually practical (i.e. not Sigma's 2.7kg pair), is all I've been asking for lens-wise from Canon for the last... well, nearly two decades.
 

padam

EOS R
Aug 26, 2015
1,254
913
As much as I would like to have a 28mm f/1.4L, I feel that right now the 28-70mm f/2L fills that gap somewhat and the usual 24mm 35mm duo will follow but with f/1.2 and very high price tags.
 

twoheadedboy

EOS R5
CR Pro
Jan 3, 2018
235
336
Kenosha, WI
As much as I would like to have a 28mm f/1.4L, I feel that right now the 28-70mm f/2L fills that gap somewhat and the usual 24mm 35mm duo will follow but with f/1.2 and very high price tags.
I just hope that eventually we get f/1.4 IS RF lenses after they've filled out the f/1.2 and f/2.0 lineup. Right now I'm sitting tight with my EF 85mm f/1.4 IS and my Sigma ART 28mm f/1.4 but those are basically the only lenses in my bag for which I can't replace w/RF. Thankfully they're both fantastic lenses as-is.
 
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Reactions: SwissFrank

padam

EOS R
Aug 26, 2015
1,254
913
I just hope that eventually we get f/1.4 IS RF lenses after they've filled out the f/1.2 and f/2.0 lineup. Right now I'm sitting tight with my EF 85mm f/1.4 IS and my Sigma ART 28mm f/1.4 but those are basically the only lenses in my bag for which I can't replace w/RF. Thankfully they're both fantastic lenses as-is.
24mm f/1.8 IS Macro is coming, that will complete the cheap line-up, otherwise I expect 24mm and 35mm f/1.2 lenses and the 135mm f/1.4
I guess enough people have accepted the properties of the new 50mm f/1.2 85mm f/1.2 and 28-70mm f/2, that I don't think they will go back to f/1.4L lenses on the wide-end.
 

SwissFrank

from EOS 1N to R
Dec 9, 2018
608
343
> There have been many patents in the past for these optical formulas

No, no no! C'mon, please don't make me mention this every time. In most of these patents, the specific lenses aren't being patented. They're just an example implementation of a lens design formula that's being patented.

Really what you want to say is: there have been many patents in the past for that have example implementations with these specs.
 

twoheadedboy

EOS R5
CR Pro
Jan 3, 2018
235
336
Kenosha, WI
24mm f/1.8 IS Macro is coming, that will complete the cheap line-up, otherwise I expect 24mm and 35mm f/1.2 lenses and the 135mm f/1.4
I guess enough people have accepted the properties of the new 50mm f/1.2 85mm f/1.2 and 28-70mm f/2, that I don't think they will go back to f/1.4L lenses on the wide-end.
I don't think it's a matter of "going back". I think it's a matter of market segmentation. f/1.2 lenses are amazing but hella expensive and huge. The f/1.8 lenses are great and reasonably priced. I think there's a place for f/1.4 versions of a few of the lenses.
 

neuroanatomist

I post too Much on Here!!
CR Pro
Jul 21, 2010
25,589
3,930
At these sizes I’m out. Might as well adapt EF glass it comes out around the same length even with the EF adapter.
They do seem rather long. The EF 35/1.4 L II is 106mm long, with the mount adapter that would be 126mm. The patent for the RF 35/1.4 yields a lens that's 124mm long, and with filter threads on the front it would likely be the same length as the adapted EF lens.