Canon Patents

Patent: Canon RF mount Big White Lenses

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Big white lenses for the RF mount are a logical next step for Canon, and I was expecting to see at least a couple of them announced ahead of the Tokyo games this year, but that appears to still be in a certain level of flux, so who knows at this point?

Outside of an RF 300mm f/2.8L IS USM, all of the optical formulas that appear in this USPTO patent uncovered by Northlight Images are also part of the rumoured RF lens roadmap that I published a while ago.

Another of the rumoured lenses on our roadmap is an RF 1200mm f/8L IS USM, but I haven’t seen any sort of patent reference for such an optical formula yet.

Canon RF 300mm f/2.8L IS USM
Focal Length 292.50mm
F-Number 2.91
Half Angle of View 4.23°
Image Height 21.64mm
Total Lens Length 274.19mm
Backfocus 52.99mm
Canon RF 400mm f/2.8L IS USM
Focal Length 390.15mm
F-Number 2.91
Half Angle of View 3.17°
Image Height 21.64mm
Total Lens Length 371.16mm
Backfocus 54.90mm
Canon RF 500mm f/4L IS USM
Focal Length 489.84mm
F-Number 4.12
Half Angle of View 2.53°
Image Height 21.64mm
Total Lens Length 385.02mm
Backfocus 55.61mm
Canon RF 600mm f/4L IS USM
Focal Length 584.72mm
F-Number 4.12
Half Angle of View 2.12°
Image Height 21.64mm
Total Lens Length 452.08mm
Backfocus 55.69mm
Canon RF 800mm f/5.6L IS USM
Focal Length 789.82mm
F-Number 5.88
Half Angle of View 1.57°
Image Height 21.64mm
Total Lens Length 489.04mm
Backfocus 82.90mm

H. Jones

Photojournalist
Aug 1, 2014
736
1,438
Interesting that they all are listed as longer than the EF mount versions?

I'm guessing that the design for telephoto lenses stays pretty similar except that they basically have a built in RF adapter to bridge the extra backfocus, but I'm sure there's not much Canon can do about that in those designs
 

padam

EOS R
Aug 26, 2015
1,257
915
With the new RF teleconverters these are going perform even better than before.
 

tron

EOS R5
CR Pro
Nov 8, 2011
4,962
1,316
No DO design plus the latest big whites have superb IQ. I will pass. Automatically I will be saving huge amount of money.
Of course if someone starts from scratch that is a different story.
 

H. Jones

Photojournalist
Aug 1, 2014
736
1,438
Hoping for a 600 mm RF big white that will drive down the cost of the EF 600mm III.

I would be very interested to know if Canon will make a whole new lens for the 600mm on the RF mount, or will adapt the EF design for RF uses in some way.

I assume Canon has been eyeing making the big whites DO like in their sample DO 600mm F/4, which looked amazing, but it seems like that has taken awhile.

Another interesting thought--I know the F/11 lenses are consumer based, but what if Canon make the 500mm F/4, for example, collapsible as well? I see no reason they couldn't make a super sturdy geared mechanism for that.
 

fox40phil

5DIV & RP
Apr 12, 2013
250
152
Germany
www.phileas-schoenberg.de
My wishes to new white L primes:
Reducing the price... and the minimum focus distance!! more in the direction of zoom lenses please... not over 3m! <3m would be fine to me!

To have a solid line-up Canon needs a great combination of bright (2.8/4.0) and more mobile/flexible lenses (4.0/5.6 & ZOOOMS!)
 

tron

EOS R5
CR Pro
Nov 8, 2011
4,962
1,316
My wishes to new white L primes:
Reducing the price... and the minimum focus distance!! more in the direction of zoom lenses please... not over 3m! <3m would be fine to me!

To have a solid line-up Canon needs a great combination of bright (2.8/4.0) and more mobile/flexible lenses (4.0/5.6 & ZOOOMS!)
And the size ... and the weight ... and then I wake up :ROFLMAO:

EDIT: But some of these can be achieved by ... cheating on f/sise: Let's say a 600 f/5.6 DO or a 800 f/8 or ...
 
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AlanF

Stay at home
CR Pro
Aug 16, 2012
8,688
11,698
With the new RF teleconverters these are going perform even better than before.
I would not be so sure. Canon's MTF charts certainly don't show that comparing the effects of the 1.4xTCIII on the 100-400mm II with the RF 1.4x on the 100-500mm. Also, the new designs for the big whites have Canon's new method of reducing weight by replacing the heavy big elements at the front behind the front element with smaller ones further back. This slightly lowers the IQ of the 600mm f/4 L according to TDP https://www.the-digital-picture.com...LensComp=748&CameraComp=0&FLIComp=0&APIComp=0 and Canon's MTF chart for the old 400mm f/2.8 II (right) is better than for the version III (left).

mtf_400_III.png
mtf_400_II.png
 

justaCanonuser

Grab your camera, go out and shoot!
Feb 12, 2014
853
699
Frankfurt, Germany
Another interesting thought--I know the F/11 lenses are consumer based, but what if Canon make the 500mm F/4, for example, collapsible as well? I see no reason they couldn't make a super sturdy geared mechanism for that.
Or a module system, like Leica's APO-Telyt-Modules for their R system once ;):

 

goldenhusky

EOS RP
CR Pro
Dec 2, 2016
432
253
I had a hope Canon will do a mount conversion service on the EF 600mm f/4L IS USM III and EF 400mm f/2.8L IS III, but if they are going to introduce new lens probably they are not going to do mount conversion on the EF version
 
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edoorn

EOS RP
Apr 1, 2016
354
329
Would be a great opportunity (although expensive) to move forward to a 400 2.8. The current EF III is amazingly light. Currently shooting a 500 f/4 so I’d have to sell that to make it financially bearable, but 400 2.8 would fit my needs better