Canon Patents

Patent: Canon RF 15-35mm f/4L

Canon Rumors
Posted onNov 26, 2020 at 8:44 AM
Updated onUpdated on Nov 26, 2020 at 8:46 AM

Canon News has uncovered a patent for a lens that will surely be coming in the future from Canon. I have reported that a Canon RF 14-35mm f/4L IS USM was on the way. Perhaps the “14mm” was a type and it will in fact be 15mm at the wide end.

This patent also includes an optical formula that has a wide end of 16mm.

I suspect we’re going to see this lens or something very similar announced in 2021.

Canon RF 15-35mm f/4L
Focal Length 15.45mm 24.00mm 33.95mm
F Number 4.12 4.12 4.12
Half Angle of View 54.47° 42.03° 32.51°
Image Height 21.64mm 21.64mm 21.64mm
Total Lens Length 150.01mm 141.11mm 140.23mm
Backfocus 19.25mm 31.83mm 46.78mm
Canon RF 16-35mm f/4L
Focal Length 16.48mm 24.00mm 33.95mm
F Number 4.12 4.12 4.12
Half Angle of View 54.47° 42.03° 32.51°
Image Height 21.64mm 21.64mm 21.64mm
Total Lens Length 132.09mm 128.84mm 134.21mm
Backfocus 10.35mm 19.54mm 33.20mm
Canon Rumors
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A

analoggrotto

EOS RP
Aug 27, 2016
271
158
1. Canon is doomed.

2. I really thought they would give the F4L wide zoom some more reach.

3. bet this will be another supercompact wonder
 
usern4cr

usern4cr

R5
CR Pro
Sep 2, 2018
729
792
Kentucky, USA
The 16-35 f4L patent mentions a 10.35mm :oops: backfocus at max wide angle. Wow, that's sticking the lens edge half way past the mount towards the sensor. And you still have to have room for the 1st & 2nd mechanical shutter and housing mechanism! Sometimes I'm just amazed at what they can design & build.
 
koenkooi

koenkooi

EOS R
CR Pro
Feb 25, 2015
1,488
1,290
usern4cr said:
The 16-35 f4L patent mentions a 10.35mm :oops: backfocus at max wide angle. Wow, that's sticking the lens edge half way past the mount towards the sensor. And you still have to have room for the 1st & 2nd mechanical shutter and housing mechanism! Sometimes I'm just amazed at what they can design & build.
Click to expand...
And an ND filter stack on the C70!
 
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usern4cr

usern4cr

R5
CR Pro
Sep 2, 2018
729
792
Kentucky, USA
sanj said:
What does 'focus by wire' mean, please?
Click to expand...
Assuming this is one of those "lost in translation" issues: "Focus by wire" is just a rotating ring with high resolution encoders that the camera sense so that it can adjust the AF mechanism accordingly. It removes the complexity of a mechanical user focus mechanism which would interfere with the latest high-tech AF mechanisms. I think "focus by wire" is the best thing you can have, provided they can make it feel smooth with proper damping/resistance with the proper range of motion from near-to-far and making it as par-focal as possible when combined with the mechanical zoom often used. It's also best (IMHO) when it's a fixed (predictable) focus range instead of a continuously spinning +/- one, but I'm sure others will prefer the other.
 
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D

Doug7131

EOS 7D
Jul 21, 2019
27
88
blackcoffee17 said:
Why almost every mirrorless lens is focus by wire? Is there any technical limitation for mirrorless?
Click to expand...
Focus by wire is usually cheaper and less mechanically complex. It also gives more freedom to use multiple focus groups in the lens without having to worry about mechanically linking them all to a single control ring. A bonus is that it (potentially) allows the user to customise how the focus ring behaves.
 
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ColinJR

ColinJR

EOS-R
Nov 27, 2018
81
90
robertsonrep.com
I too was hoping they could get down to 14mm for the f/4 version... Alas.

Side note, does anyone know why the 15-35 2.8 is backordered everywhere, and maybe when they might be back in stock?
 
Mr Majestyk

Mr Majestyk

EOS RP
Feb 20, 2016
319
177
Australia
BeenThere said:
The EF 16-35 f~4 is a joy to use. I will hang on to that one. Also, using the EF version permits the filter adapter to be used (Thinking NDs from Breakthrough).
Click to expand...
Zero reason at all to update that beauty. I use it on my Sony A7RIII and won't be swapping it for any native options.
 
S

Skyscraperfan

1D X
Aug 7, 2018
64
32
15.45 and 16.48 are suspicious numbers. It seems Canon want to be able to round down and sell them as 15mm and 16mm. I always hate cheating like that. I am not a lens engenieer, but if you have a formula for a 15.45mm lens, it should be technically possible to tweak some parameters and make it exactly 15mm. The same is true at the long end of tele lenses, where Canon often rounds up.

It is good though that Canon brings slower versions of its very expensive lenses with f/2.8. With a powerful IBIS you do not need much light and I usually chose an aperture just below the diffraction limit of the camera to get as much depth of field as possible. That's f/11 at my 18 megapixel camera. So f/2.8 for me is just something that makes a lens twice as heavy and twice as expensive and I only need it for low light hand held shots.
 
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