Canon Patents

Patent: Full frame f/2 zoom, possibly for mirrorless?

A patent application showing an unusual f/2 zoom from Canon has appeared in Japan (Patent application: 2018-132675). It’s possible that this zoom lens is related to a  mirrorless camera body with its short BF distance.

Canon News tells us that the patent itself deals with a floating focus system to help reduce the size of the lens.

Japan patent application 2018-132675:

Focal distance      90.00 125.01 145.99 109.96 130.49
F number             2.06   2.06   2.06   2.06   2.06
a half field angle  13.52   9.82   8.43  11.13   9.41
Image height        21.64  21.64  21.64  21.64  21.64
Whole length       242.35 242.35 242.35 242.35 242.35
BF                  16.70 1 6.70  16.70  16.70  16.70 

Focal distance      72.03 115.04 145.99  92.39 123.70
F number             2.06   2.06   2.06   2.06   2.06
a half field angle  16.72  10.65   8.43  13.18   9.92
Image height        21.64  21.64  21.64  21.64  21.64
Whole length       217.72 217.72 217.72 217.72 217.72
BF                  22.47 2 2.47  22.47  22.47  22.47 

Focal distance      72.00 114.84 146.00  92.60 123.41
F number             2.06   2.06   2.06   2.06   2.06
a half field angle  16.72  10.67   8.43  13.15   9.94
Image height        21.64   21.64  21.64 21.64  21.64
Whole length       210.32 210.32 210.32 210.32 210.32
BF                  21.80  21.80 21.80   21.80  21.80 

The optical formulas show a very short zoom range, but being an f/2 lens, that would make some sense.

Optical formulas in the application:

  • 90-130mm f/2
  • 70-125mm f/2
  • 70-125mm f/2 (shorter backfocus)

Maximilian

The dark side - I've been there
Nov 7, 2013
2,650
463
Germany
Interesting.
I would really like to see something like that in RL.
Esp. lenth, feel in the hand and - of course - IQ.
 

melgross

EOS 7D MK II
Nov 2, 2016
414
219
Boy, that’s a lot of elements.

Now that Nikon has announced, they’re being criticized for the new Z mount lens selection. It would be nice if this (these?) lens(es) would be announced at the same time as Canon’s New cameras.
 

RGF

How you relate to the issue, is the issue.
Jul 13, 2012
2,816
35
very narrow zoom range. Does not interest me, but perhaps this is a technical demonstration, not a real product?
 

Josh Leavitt

EOS T7i
Aug 19, 2018
92
104
This would seem to be a portrait zoom.
Most definitely. And I would think it would be an ideal portrait zoom - essentially consolidating the 85mm F/1.8 USM, 100mm F/2 USM, and 135mm F/2L USM into one lens. For the 90-130mm F/2 at least. But the 70-125mm is an interesting focal length as well.
 

Hesbehindyou

EOS 80D
Jun 6, 2011
145
2
This is likely just a technical demonstration to illustrate the floating focus mechanism, perhaps chosen because it shows a large size-reduction in the lens i.e. they've chosen a focal range and aperture that most clearly shows the size-reduction benefits of floating focus.

Then again, why make things complicated with all those elements if it's just a paper exercise so maybe this is a lens that's being developed. As others have pointed out, it's perfect for portraits (though maybe I'd like it to be a little longer but that could just be because I've got a large, unflattering nose)
 

Daner

EOS M50
Aug 15, 2017
35
23
Stockholm
I have been tempted by Sigma's 50-100 f1.8 for my 7D Mk. II, but I haven't been convinced. An EF 70-140 f2 from Canon would be more likely to convince me.
 

CanonFanBoy

EOS 5D SR
Jan 28, 2015
4,155
1,715
Irving, Texas
Looks like you can actually get it now :D
Hopefully it will be in the 2020 releases. :) I would take that over any 70-200 f/2.8. I had a feeling there might be something special to match the 28-70. Now I just hope it gets produced. Maybe, just maybe it will be internal zoom also. o_O
 
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