Canon Patents

Patent: Canon RF 70-200mm f/4

With the Canon RF 70-200mm f/2.8L IS already announced, it was only a matter of time before an f/4 version of the lens hit the market. This patent shows that Canon is actively working on such a lens.

Unlike the RF 70-200mm f/2.8L IS, the f/4 version in this patent appears to show an internal zoom lens design.

Canon RF 70-200mm f/4L:

  • Focal Length: 72.20mm 130.45mm 194.20mm
  • F-Number: 4.00 3.95 4.00
  • Angle of View: 16.68° 9.42° 6.36°
  • Image Height: 21.64mm 21.64mm 21.64mm
  • Total Lens Length: 215.54mm 215.54mm 215.54mm
  • BF: 25.98mm 25.98mm 25.98mm

Additionally, there is also an optical formula for an EF 58mm f/1.4 with what may feature a dual AF motor focus system according to Canon News.

Canon EF 58mm f/1.4

  • Focal Length 57.79mm
  • F-Number 1.44
  • Angle of View 20.52°
  • Image Height 21.64mm
  • Total Lens Length 163.89mm
  • BF 39.99mm

neuroanatomist

I post too Much on Here!!
Jul 21, 2010
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The lens would be ~20mm longer than the EF 70-200/4...so as with the RF 70-200/2.8 when extended to 200mm, the sensor to front element distance would be essentially the same for the RF version on a MILC and the EF version on a DSLR.
 

Maximilian

The dark side - I've been there
Nov 7, 2013
2,518
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Germany
Would be quite surprising to me if that patent became product, as Canon seems to go the telescoping way with the RF 70-200/2.8.
Why not doing it the same with the f/4 version?
 

mb66energy

EOS 6D MK II
Dec 18, 2011
1,234
158
Germany
www.MichaelBockhorst.de
Good news: One more reason to keep the70-200 4 IS mk i because it will have the same size including the adapter.

Really interesting: A 12 lens / 10 group design might help to increase contrast and flare resistens furthermore compared
to the 20/15 design of my lens! But maybe no IS group - a hint for IBIS coming?

Or it's just a not-so-espensive lens.
 

Kit.

EOS 6D MK II
Apr 25, 2011
1,099
519
I don't see the point of this lens without IS. Probably it's just a patent.
 

Josh Leavitt

EOS T7i
Aug 19, 2018
91
102
I don't see the point of this lens without IS. Probably it's just a patent.
Yeah, probably. The only other reason I can see for omitting OIS is to deliver a highly optically corrected zoom lens at a very low MSRP. Considering the exceptional quality EF 70-200 F/4L II already has 5 stops of OIS and only retails for $1299, this lens would have to come in at $799 at the most I think.
 

juststeve

I'm New Here
Nov 29, 2018
19
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The lens element diagram shown is not for a zoom lens. When a lens zooms, elements have to move. Ain't no way lens elements in that thing are going to move unless it is hit by a train. Beside, there is/are no jigglator element(s) for IS. Looks more like a 135/2 or 1.8 diagram.
 

Trey T

EOS T7i
Feb 6, 2019
98
42
has there been images of the physical RF 70-200mm f/2.8 @ 200mm yet? is the length, @200mm, the same as EF version or longer?
 

QuisUtDeus

EOS 80D
Feb 20, 2019
115
80
has there been images of the physical RF 70-200mm f/2.8 @ 200mm yet? is the length, @200mm, the same as EF version or longer?
No images. Canon won't even confirm that it extends on zooming; I think they're going to pretend that's not the case until the NDA drops for the reviewers.
 
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canonnews

EOS RP
Dec 27, 2017
256
155
Canada
www.canonnews.com
The lens element diagram shown is not for a zoom lens. When a lens zooms, elements have to move. Ain't no way lens elements in that thing are going to move unless it is hit by a train. Beside, there is/are no jigglator element(s) for IS. Looks more like a 135/2 or 1.8 diagram.
hah! good catch.

the image that is shown there is for the EF 58mm 1.4.

I've added the 70-200/4 image to my article on all this, also there appears to be IS on the 70-200. at least there could be as there is an optical grouping that canon usually shoves IS on.
 
Last edited:

flip314

EOS 80D
Sep 26, 2018
174
202
IBIS baby. IBIS might replace in lens stabilisation.
IBIS will never replace OIS for telephoto lenses. The longer the lens gets, the further you would have to move the sensor to correct for it. OIS makes much more sense for longer lenses (or potentially OIS+IBIS).

But Canon is still selling EF 70-200s with and without IS, we may see the same thing for RF.
 
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yinzer

I'm New Here
Feb 25, 2019
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jd7

EOS 7D MK II
Feb 3, 2013
719
91
I'd be very interested in a 58mm f/1.4 (or any fast prime around the 60mm-ish focal length)! The question is where Canon would position it, given the already-existing RF 50/1.2L and EF 50/1.2L?
 

neuroanatomist

I post too Much on Here!!
Jul 21, 2010
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I'd be very interested in a 58mm f/1.4 (or any fast prime around the 60mm-ish focal length)! The question is where Canon would position it, given the already-existing RF 50/1.2L and EF 50/1.2L?
As a non-L lens.
 

jd7

EOS 7D MK II
Feb 3, 2013
719
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As a non-L lens.
You are probably correct about that - it does seem to make sense. And if so, it should at least tend to limit the price a bit, so I might end up being happy enough about it!

That said, Canon does have both the 85/1.2L II and the 85/1.4L though so ...? The 85s are EF lenses though, of course, and there is already a broad EF range, but the same cannot yet be said for the RF range. My guess (similar to yours, I think(?)) is that at this stage of development of the RF line, if Canon released another 50-ish RF prime, it would be at the relatively cheaper level compared with an L lens.
 

neuroanatomist

I post too Much on Here!!
Jul 21, 2010
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That said, Canon does have both the 85/1.2L II and the 85/1.4L though so ...? The 85s are EF lenses though
They also have the EF 85/1.8, a non-L lens that’s much cheaper than the L versions.

With the ‘affordable’ RP, I expect we’ll see non-L lenses to go with it, we already know about the 24-240.
 

Jethro

EOS R
Jul 14, 2018
188
82
I'm surprised at the lack of OIS in the announced (and patent leaked) RF lenses so far. I get the desire to concentrate on great optical results but a lot of people (including me) won't upgrade from existing (generally IS) lenses until RF IS versions exist. Maybe they're not too fussed if I (and my demographic) don't update for a while, but it seems to be a missed opportunity ...
 

juststeve

I'm New Here
Nov 29, 2018
19
29
For a little light reading while having my morning cup of coffee, I read the patent. Not only does the 58/1.4 patent show two moving focusing elements, but also the 70-200/4 shows it and mentions having two sets of moving elements for focusing.