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

Canon Rumors Guy

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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...
Continue reading...
 
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mb66energy

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Dec 18, 2011
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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.
 

peters

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Dec 25, 2017
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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

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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

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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.
 

SecureGSM

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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.