June 22, 2018, 07:42:49 AM

Author Topic: Patent: Canon 24-70 f/2.8 Optical Formula and More  (Read 2237 times)

Canon Rumors

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Patent: Canon 24-70 f/2.8 Optical Formula and More
« on: March 22, 2018, 11:40:24 AM »
A patent showcasing a host of optical formulas from Canon has appeared over at Canon News. These patents deal with small focusing groups that allow for light and fast autofocus performance, perhaps more geared to STM than to USM motors being used.

Optical Formulas Covered in the Patent:

  • 11-22mm f/4-5.6
  • 24-70mm f/2.8
  • 35mm f/2.8
  • 18-150mm f/3.5-6.3

We’re not sure if these are EF, EF-S, or EF-M lenses, or a mixture of all three mounts.

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Patent: Canon 24-70 f/2.8 Optical Formula and More
« on: March 22, 2018, 11:40:24 AM »

Sharlin

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Re: Patent: Canon 24-70 f/2.8 Optical Formula and More
« Reply #1 on: March 22, 2018, 12:18:31 PM »
Based on the numbers (image height and backfocus) the mounts appear to be what one would expect: the 18–150 and the 11–22 are EF-M, the 35mm is EF-S, and the 24–70 is EF.

jolyonralph

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Re: Patent: Canon 24-70 f/2.8 Optical Formula and More
« Reply #2 on: March 22, 2018, 12:26:35 PM »
Do the 11-22 and 18-150 layouts match the existing lenses or are these new variants?
Jolyon Ralph

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syyeung1

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Re: Patent: Canon 24-70 f/2.8 Optical Formula and More
« Reply #3 on: March 23, 2018, 12:13:07 AM »
Possibly native lens for FF mirrorless?

rs

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Re: Patent: Canon 24-70 f/2.8 Optical Formula and More
« Reply #4 on: March 24, 2018, 06:10:22 AM »
Focal distance        36.10
F number               2.92
Half field angle      20.73
image height          13.66
Whole length          98.76
BF 35.46

With an image height of 13.66mm, this 35mm lens is an APS-C lens.
The back focus indicates it is for a DSLR.
Therefore this is likely an EF-S mount 35/2.8 lens.

Focal distance        18.56  48.87 145.41
F number               3.60   5.56   6.49
a half field angle -- 36.35  15.62   5.37
Image height          13.66  13.66  13.66
Whole length         103.26 118.62 145.33
BF                    10.65  10.65  10.65

Again, 13.66mm means the 18-145 is an APS-C lens.
The BF is for mirrorless.
Therefore likely EF-M mount 18-145/3.5-6.3.

Focal distance        24.76  30.10  67.98
F number               2.92   2.92   2.91
a half field angle -- 41.15  35.71  17.65
Image height          21.64  21.64  21.64
Whole length         198.84 183.00 165.88
BF                    38.37  38.37  38.37

The 24-70 is a FF lens (21.64mm image height)
The BF indicates this is for a DSLR.
Therefore likely EF mount 24-70/2.8.

Focal distance        11.33  15.16  21.84
F number               4.10   4.65   5.72
a half field angle--  50.33  42.03  32.02
Image height          13.66  13.66  13.66
Whole length          88.44  85.64  87.26
BF                     9.00  14.02  22.72

The 11-22 is an APS-C lens (13.66mm).
It is more mirrorless (BF is too short for a DSLR).
Therefore likely EF-M mount 11-22/4-5.6.
5D II | M2 | 16-35/4 L IS | 24-70/2.8 L II | 70-200/2.8 L IS II | SY 12/2.8 | 40/2.8 | 85/1.2 L II | 100/2.8 L IS | 22 M | 18-55 M | EF-EOS M | 1.4x TC II | 580EX II | 90EX

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Re: Patent: Canon 24-70 f/2.8 Optical Formula and More
« Reply #4 on: March 24, 2018, 06:10:22 AM »