Patent: Canon 50mm f/3.5 IS Macro for Full Frame Mirrorless

[Mt Spokane Photography]

The patent has three working examples. It is not tied to a particular lens type or design, the formulas can apply to any Canon lens type, be it video, FF, APS-C, or P&S.

The numbers in the example may not reveal the actual intended usage.




Example 1

Focal distance 31.01
F number 3.50
a half field angle (degree) -- 23.77
Image height 13.66
Whole length of the lens 54.98
BF 18.44


Example 2

Focal distance 21.77
F number 3.50
a half field angle (degree) -- 20.04
Image height 7.94
Whole length of the lens 39.45
BF 14.25


Example 3

Focal distance 48.58
F number 3.50
a half field angle (degree) -- 24.01
Image height 21.64
Whole length of the lens 85.71
BF 27.79

 

[that1guyy]

so yet another mount from canon? and they said sony had a lot of mounts.

 

[TeT]

It could be a compact camera design with integrated lens....

Shouldn't we be moving towards a compact lens with integrated camera by now...

 

[Antono Refa]

https://goo.gl/DCXxJ7

There are 3 examples to this patent. None of them have an image height larger than 24mm. Example 3 is only 21.6 mm

On the other hand, example 1 is much more plausible. This looks more like an attempt at a 30mm lens for EF-M OR a lens to fit on a 1.5-inch type sensor. Back focus of 18.44 (EF-M is 18 mm). Focal length is 31mm (30 mm nominal). f/3.5 aperture. Image height is 13.66 mm (APS-C on Canon is 14.9 mm, G1X sensor is 14mm). Length is 55mm.

I'm not sure I follow. 21.6mm is full frame.

No it isn't, 24mm is. 135 format is 36mm x 24mm.

Image height, in this context, is the distance between the center of the sensor to it's corner.

sqrt(36^2+24^2)/2 = 21.633, therefore this is an FF lens.

 

[privatebydesign]

https://goo.gl/DCXxJ7

There are 3 examples to this patent. None of them have an image height larger than 24mm. Example 3 is only 21.6 mm

On the other hand, example 1 is much more plausible. This looks more like an attempt at a 30mm lens for EF-M OR a lens to fit on a 1.5-inch type sensor. Back focus of 18.44 (EF-M is 18 mm). Focal length is 31mm (30 mm nominal). f/3.5 aperture. Image height is 13.66 mm (APS-C on Canon is 14.9 mm, G1X sensor is 14mm). Length is 55mm.

I'm not sure I follow. 21.6mm is full frame.

No it isn't, 24mm is. 135 format is 36mm x 24mm.

Image height, in this context, is the distance between the center of the sensor to it's corner.

sqrt(36^2+24^2)/2 = 21.633, therefore this is an FF lens.

My apologies, I knew that once but lost it in the mists of time! But I believe I am correct in the BF comments, it can't be an EF lens, possibly EF-M, but not EF or EF-S.

 

[Antono Refa]

My apologies, I knew that once but lost it in the mists of time! But I believe I am correct in the BF comments, it can't be an EF lens, possibly EF-M, but not EF or EF-S.

Well, that's what the title of the thread says - FF lens with a flange distance typical of mirrorless cameras, e.g. EOS-M

 

[privatebydesign]

My apologies, I knew that once but lost it in the mists of time! But I believe I am correct in the BF comments, it can't be an EF lens, possibly EF-M, but not EF or EF-S.

Well, that's what the title of the thread says - FF lens with a flange distance typical of mirrorless cameras, e.g. EOS-M

And titles here have never been wrong inaccurate or misleading here, ever...............

 

[Antono Refa]

My apologies, I knew that once but lost it in the mists of time! But I believe I am correct in the BF comments, it can't be an EF lens, possibly EF-M, but not EF or EF-S.

Well, that's what the title of the thread says - FF lens with a flange distance typical of mirrorless cameras, e.g. EOS-M

And titles here have never been wrong inaccurate or misleading here, ever...............

Nobody's perfect.

 

[Wizardly]

https://goo.gl/DCXxJ7

There are 3 examples to this patent. None of them have an image height larger than 24mm. Example 3 is only 21.6 mm

On the other hand, example 1 is much more plausible. This looks more like an attempt at a 30mm lens for EF-M OR a lens to fit on a 1.5-inch type sensor. Back focus of 18.44 (EF-M is 18 mm). Focal length is 31mm (30 mm nominal). f/3.5 aperture. Image height is 13.66 mm (APS-C on Canon is 14.9 mm, G1X sensor is 14mm). Length is 55mm.

I'm not sure I follow. 21.6mm is full frame.

No it isn't, 24mm is. 135 format is 36mm x 24mm.

Image height, in this context, is the distance between the center of the sensor to it's corner.

sqrt(36^2+24^2)/2 = 21.633, therefore this is an FF lens.

Good catch. However, I'm still more convinced that example 1 is the most plausible. 13.41mm is the half-diagonal for the EOS M3 APS-C sensor, consistent with the 13.66 half-diagonal stated in that example for the flange distance that exists on the EF-M mount. Example 2 seems to be intended towards the 1-inch sensor size (not the 1.5 inch I had thought earlier). Example 3 could work on a 135 format (FE-mount) body with the rear element recessed into the lens by 1 cm.

Really these are just results to match half-diagonal (image heights) in existence. That a solution exists for the 135-format doesn't mean it will result in a new mount. Besides, a 135-format DSLM body could easily show up with an adaptor to existing lenses long before any lenses emerge (just like EF to FE rigs exist already).