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

analoggrotto · Nov 26, 2020

1. Canon is *******.

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

3. bet this will be another supercompact wonder

SV · Nov 26, 2020

These f/4's are nice for travel and hiking, being lighter and smaller.

BeenThere · Nov 26, 2020

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).

blackcoffee17 · Nov 26, 2020

Why almost every mirrorless lens is focus by wire? Is there any technical limitation for mirrorless?

fred · Nov 26, 2020

So... no IS anymore?

usern4cr · Nov 26, 2020

The 16-35 f4L patent mentions a 10.35mm

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 · Nov 26, 2020

usern4cr said:
The 16-35 f4L patent mentions a 10.35mm 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.

And an ND filter stack on the C70!

danfaz · Nov 26, 2020

fred said:
So... no IS anymore?

The 2.8 has IS, don't see why this wouldn't.

usern4cr · Nov 26, 2020

koenkooi said:
And an ND filter stack on the C70!

Yeah, I forgot about the ND filter stack. I wonder if there will be a restriction on the C70 (or others) regarding some R lenses with a very small back focus (eg 10mm) where the lens might hit it?

sanj · Nov 26, 2020

Canon Rumors Guy said:
Continue reading...

Been waiting for this!!! It will have IS

sanj · Nov 26, 2020

blackcoffee17 said:
Why almost every mirrorless lens is focus by wire? Is there any technical limitation for mirrorless?

What does 'focus by wire' mean, please?

usern4cr · Nov 26, 2020

sanj said:
What does 'focus by wire' mean, please?

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.

Doug7131 · Nov 26, 2020

blackcoffee17 said:
Why almost every mirrorless lens is focus by wire? Is there any technical limitation for mirrorless?

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.

ColinJR · Nov 26, 2020

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?

Andy Westwood · Nov 26, 2020

I'd be interested a new RF wide lens, make it small and compact please Canon

Rocksthaman · Nov 26, 2020

I’m really hoping for an RF 24-70 F4.

I love the size on the EF version.

Mr Majestyk · Nov 26, 2020

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).

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.

sanj · Nov 27, 2020

Mr Majestyk said:
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.

Ok. But the RF will be lighter, smaller and slightly better overall IQ. Your decision. For me, I will buy it.

Skyscraperfan · Nov 27, 2020

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.

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

EOS RP

EOS M6 Mark II

EOS R

EOS RP

I'm New Here

R5

EOS 5D Mark IV

RSIX

R5

EOS R5

EOS R5

R5

EOS 7D

EOS-R

EOS R6

Eos R , R6 , R5

EOS RP

EOS R5

1D X

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