Canon Patent: 135mm f/2 1:2 Macro And 200mm f/2.4 1:2 Macro Lenses

February 8, 2022
Canon Patents
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Drawing from the patent literature

And yet another Canon patent application: 135mm f/2 1:2 Macro And 200mm f/2.4 1:2 Macro Lenses.

Canon patent application 2022-22595 (Japan) discusses optical formulas for two macro lenses: 135mm f/2 1:2 M.

PROBLEM TO BE SOLVED: To provide an optical system capable of expanding a close range in a small size while suppressing the number of focus groups, and an image pickup apparatus having the same.
If the floating focusing method is used to increase the close-up magnification, the number of lenses in each group increases, and it is difficult to drive the focus group at high speed. In the lenses of Patent Document 1 and Patent Document 2, when the number of lenses in the focus group is reduced in order to realize high-speed drive, sufficient aberration performance cannot be obtained because the configuration of each group is not appropriate.
An object of the present invention is to provide an optical system capable of expanding a close range in a small size while suppressing the number of focus groups, and an image pickup apparatus having the same.

Example 1

Focal length: 133.0
F value: 2.05
Half angle of view: 9.24
Image height: 21.64
Shooting magnification: -0.5

Example 3

Focal length: 200.0
F value: 2.40
Half angle of view: 6.18
Image height: 21.64
Shooting magnification: -0.5

Example 4

Focal length: 199.9
F value: 2.80
Half angle of view: 6.18
Image height: 21.64
Shooting magnification: -1.00

The Canon patent application was spotted by asobinet.com. More Canon patent applications are listed here. Some particularly interesting patent applications we think might get into production are these: