Canon Patents

Patent: Lots of optical formula lens patents for the RF mount

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Canon is full steam ahead as far as lens development goes, as a whole slew of optical formulas have appeared at patent offices.

First up, the RF mount.

Japan Patent Application 2019-066701

Canon RF 15-35mm f/2.8L

  • Focal distance 15.30mm 24.20mm 34.00mm
  • F number 2.91 2.91 2.91
  • Field angle 54.73° 41.80° 32.47°
  • Image height 21.64mm 21.64mm 21.64mm
  • Whole length of the lens 135.05mm 125.84mm 125.33mm
  • BF 13.00mm 22.20mm 32.26mm

Canon RF 17-70mm f/3.5-5.6

  • Focal distance 17.3mm 35.00mm 68.00mm
  • F number 3.58 4.18 5.85
  • Field angle 51.35° 31.72° 17.65°
  • Image height 21.64mm 21.6mm4 21.64mm
  • Whole length of the lens 142.70mm 138.53mm 143.42mm
  • BF 13.32mm 29.60mm 57.62mm


Japan Patent Application 2019-066654

Canon RF 15-35mm f/4L

  • Focal distance 15.45mm 24.00mm 34.00mm
  • F number 4.12 4.12 4.12
  • Half field angle 54.47° 42.03° 32.47°
  • Image height 21.64mm 21.64mm 21.64mm
  • Whole length of the lens 125.38mm 119.21mm 116.89mm
  • BF 12.00mm 19.66mm 24.40mm

Canon RF 16-35 f/4L

  • Focal distance 16.48mm 24.00mm 34.00mm
  • F number 4.12 4.12 4.12
  • Half field angle 52.70° 42.03° 32.47°
  • Image height 21.64mm 21.64mm 21.64mm
  • Whole length of the lens 127.27mm 116.39mm 111.30mm
  • BF 10.95mm 16.82mm 23.58mm

Japan Patent Application 2019-066653

Canon RF 14-40mm f/4L

  • Focal distance 14.43mm 21.62mm 40.74mm
  • F number 4.12 4.12 4.12
  • Half field angle 56.30° 45.01° 27.97°
  • Image height 21.64mm 21.64mm 21.64mm
  • Whole length of the lens 138.31mm 128.15mm 129.29mm
  • BF 12.84mm 12.84mm 12.84mm

Canon RF 16-40mm f/4L

  • Focal distance 16.41mm 23.12mm 38.80mm
  • F number 4.12 4.12 4.12
  • Half field angle 52.82° 43.10° 29.14°
  • Image height 21.64mm 21.64mm 21.64mm
  • Whole length of the lens 118.88mm 112.53mm 114.89mm
  • BF 12.78mm 12.78mm 12.78mm



zonoskar

EOS M6 Mark II
Aug 29, 2018
71
103
17-70mm f/3.5-5.6 is also a nice lens paired with the RP.
 
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Equinox

I'm New Here
Jun 29, 2017
19
39
oooooh lala, 14-40 F4L! Add that to the growing list of revolutionary lenses for MILC.

I bet that 17-70 will sell a load with the RP
 
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mb66energy

EOS 5D Mark IV
Dec 18, 2011
1,545
400
Germany
www.MichaelBockhorst.de
Canon RF 17-70mm f/3.5-5.6
Is a APS-C lens?
As far as I know the Image Height is the same as image radius and this is roughly 21.5mm = FF compatible.

For me an ingenious ultrawide-to-small-tele range which fits well to a 70-200 option or - if you do not mind the gap - a 100-400 option - therefore it is well suited for a two-lens-two-body solution.
 
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peters

EOS RP
Dec 25, 2017
538
523
SHUT UP AND TAKE MY MONEY!
Ha, I thought the same! Thats an incredible usefull focal lense! For weddings and travel this would be the shit! I love the Tamron 15-30, especialy for travel. But I always miss a little bit more focal lenght for some "normal" portraits or something. 14-40 sounds awesome. f2,8 would be even more awesome, but I guess that would have increased the weight and size to much. =)
 
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SecureGSM

2 x 5D IV
Feb 26, 2017
2,360
1,231
As far as I know the Image Height is the same as image radius and this is roughly 21.5mm = FF compatible.

For me an ingenious ultrawide-to-small-tele range which fits well to a 70-200 option or - if you do not mind the gap - a 100-400 option - therefore it is well suited for a two-lens-two-body solution.

Interesting. Canon 5D IV sensor height is 24mm.
Canon 700 FF has a 38.1mm x 20.1mm sensor

Therefore, the lens, seems, is suitable for Canon 700 perfectly. Or... takes care of the x1.7 video crop factor of the new R/RP. ;)
It becomes 29-120 when R/RP in video mode
 
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canonnews

EOS R
CR Pro
Dec 27, 2017
912
1,575
Canada
www.canonnews.com
Interesting. Canon 5D IV sensor height is 24mm.
Canon 700 FF has a 38.1mm x 20.1mm sensor

Therefore, the lens, seems, is suitable for Canon 700 perfectly. Or... takes care of the x1.7 video crop factor of the new R/RP. ;)
No, the image height specification is actually the radius the image circle, or 1/2 the diagonal measurement.
21.64 is the standard measurement for a full frame sensor in Canon patent applications.
 
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sanj

EOS R5
Jan 22, 2012
4,154
1,027
Canon just make a pro R body. I will not turn and look back at DSLR after that. The R lenses are killing it.
 
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SecureGSM

2 x 5D IV
Feb 26, 2017
2,360
1,231
Thank you. Makes sense. I do not shoot video but if I had to, I would consider using this lens on R.
29-120 equivalent in x1.7 crop 4K video mode.
 

dominic_siu

R5, RF1435, RF2870, RF100500, RF100 Macro
Aug 31, 2018
98
83
What should I get? RF15-35 2.8L IS or wait even longer for RF14-40 4L? >_<
 

justaCanonuser

Grab your camera, go out and shoot!
Feb 12, 2014
899
778
Frankfurt, Germany
17-70mm f/3.5-5.6 is also a nice lens paired with the RP.
I agree, if I am going for the RP (still making my mind up) I'd really prefer such a smaller, more compact and light zoom as a starter. When I want a big & fast lens, I always can adapt my EF 50mm and 85mm f/1.2 lenses - or the lighter EF 50mm f/1.4.
 
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justaCanonuser

Grab your camera, go out and shoot!
Feb 12, 2014
899
778
Frankfurt, Germany
What should I get? RF15-35 2.8L IS or wait even longer for RF14-40 4L? >_<
Depends on how much you are in a hurry. Personally, I'd prefer less fast (ultra) wide angle lenses since in most cases you need to go for higher f-stop numbers anyway to get a sufficient depth of field (landscapes, cityscapes). So, mostly you carry extra weight, need extra space and pay extra money for nothing useful. Big, fast lenses make more sense IMO in the 50 mm and upward focal distance range, e.g. for portrait. That's why I always preferred my Zeiss Distagon 18mm f/3.5 over the higher regarded Zeiss 21mm f/2.8, since the 18mm is relatively light and compact. And I nearly never shoot that one completely wide open.
 
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