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Canon Patent: 15mm F4.5 And 10mm F3.5 For APS-C Mirrorless

January 17, 2024
Canon Patents
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And here is one more Canon patent. Canon patent application 2024006604 (Japan, published 01/17/2024) discusses optical formulas for two wide prime lenses for mirrorless cameras with an APS-C imaging sensor.

15mm F4.5
10mm F3.5

From the patent literature:

An object of the present invention is to provide an optical system that can reduce the occurrence of ghosts while having high optical performance.
BACKGROUND ART: Wide-angle lenses are widely used for landscape photography, astronomical photography, and the like. Wide-angle lenses are required to have a wide angle of view and high optical performance.
Patent Document 1 discloses an optical system that has a wide angle of view and improved optical performance by employing a plurality of negative lenses on the object side to gently bend off-axis rays. ing.

Example 1

Focal length: 15.45
F value: 4.60
Half angle of view: 49.36
Image height: 18.00
Total length: 115.26
Back focus: 13.50

Example 2

Focal length: 9.97
F value: 3.50
Half angle of view: 49.63
Image height: 11.72
Total length: 72.73
Back focus: 10.06

Example 3

Focal length: 16.00
F value: 4.60
Half angle of view: 48.58
Image height: 18.14
Total length: 99.94
Back focus: 13.04

All featured Canon patents are listed here.

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Canon Patent: 24-300mm F4-5.6, 24-400mm F4-5.6 And 20-240mm F4-6.3 Lenses

January 17, 2024
Canon Patents
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Here is a new Canon patent application for what appears to be a bunch of slow zoom lenses. Kit lenses?

Canon patent application 2024005834 (Japan, published 01/17/2024) discusses optical formulas for three zoom lenses:

24-300mm F4-5.6
24-400mm F4-5.6
20-240mm F4-6.3

From the patent literature:

[Problem] To obtain a high-performance zoom lens with a high zoom ratio while the entire system is compact.
[Background Art] In recent years, as an imaging optical system used in an imaging device, a small zoom lens with a high zoom ratio (high zoom ratio), high optical performance over the entire zoom range, and a short overall lens length has been used. That is what is required.
However, in the zoom lens disclosed in Patent Document 1, the Abbe number of the positive lens included in the first lens group is small, and when the zoom ratio is increased, the longitudinal chromatic aberration becomes large, especially at the telephoto end.
Accordingly, an object of the present invention is to provide a zoom lens having a high zoom ratio and high optical performance, while the entire system is small.

Example 1

Focal length: 24.72-291
F value: 4.12-5.77
Half angle of view: 37.35-4.25
Image height: 21.64
Total length: 175-258.9
Back focus: 13.81-68.61

Example 2

Focal length: 24.72-390
F value: 4.12-5.77
Half angle of view: 37.35-3.18
Image height: 21.64
Total length: 180-300.09
Back focus: 14.63-81.63

Example 3

Focal length: 20.6-240
F value: 4.12-6.3
Half angle of view: 42.48-5.15
Image height: 21.64
Total length: 174.99-284.99
Back focus: 14.63-81.63

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Canon Displays A Concept VR/3D Lens For APS-C At CES 2024

January 15, 2024
Canon News
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Canon put a concept lens on display at CES 2024. The lens appears to be for virtual reality (VR) and/or 3D applications.

Along with the lenses, Canon also displayed a PowerShot V-series camera for VR. Here the gear that has been put on display:

APS-C 3D VR lens
APS-C 3D stereoscopic lens
360°/180° 3D VR camera

Canon already offers the RF 5.2mm F2.8L Dual Lens Fisheye lens for this kind of applications. It appears Canon is even more committed to VR. The images on top and below come from Weibo.

[via asobinet]

Canon Patent: RF-S 15-45mm F3.5-6.3 Lens For APS-C Imaging Sensors

January 8, 2024
Canon Patents
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And here is another Canon patent application for the RF-S mount. Canon patent 2023182958 (Japan, published 2023-12-27) discusses optical formulas for a lens for the RF-S mount, 15-45mm F3.5-6.3.

From the patent literature:

An object of the present invention is to provide a zoom lens with good optical performance over the entire zoom range.
[Background Art] Conventionally, a lens has a first lens group with a negative refractive power and a second lens group with a positive refractive power, which are arranged in order from the object side to the image side, and includes a focal length in the standard range. Zoom lenses are known (see Patent Documents 1 and 2).
However, in the zoom lens disclosed in Patent Document 1, the entire lens system is large and it is not possible to achieve sufficiently high image quality. Furthermore, in the zoom lens disclosed in Patent Document 2, various aberrations such as spherical aberration and coma aberration are not sufficiently corrected.
An object of the present invention is to provide a zoom lens with good optical performance over the entire zoom range.

Example 1

Focal length: 15.36-43.10
F value: 3.60-6.44
Half angle of view: 35.76-17.59
Total length: 76.36-73.51
Back focus: 10.45

Example 2

Focal length: 18.45-43.10
F value: 4.10-6.44
Half angle of view: 31.58-17.59
Total length: 80.15-79.38
Back focus: 13.47-33.69

Example 3

Focal length: 16.23-43.10
F value: 3.61-6.44
Half angle of view: 32.27-17.59
Total length: 88.10-88.68
Back focus: 10.87

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Canon Patent: 20-120mm F4 And 18-100mm F4 For RF-S Mount

January 8, 2024
Canon Patents
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A new Canon patent application (well, not really new) for two lenses for the RF-S mount.

Canon patent application 2023182926 (Japan, published 2023-12-27) discusses optical formulas for two RF-S mount lenses:

20-120mm F4
18-100mm F4

From the patent literature:

An object of the present invention is to provide a fixed-length zoom lens having a high zoom magnification and high optical performance over the entire zoom range.
BACKGROUND ART
Fixed-length zoom lenses are known in which the overall length of the lens does not change during zooming. Such a zoom lens is suitable for video shooting and the like because the center of gravity does not change much during zooming. In recent years, zoom lenses have been required to have high zoom magnification and high optical performance over the entire zoom range for video applications.
However, although the zoom lens described in Patent Document 1 is superior in that there are fewer lens groups that move during zooming and focusing, improvements in optical performance are required as the resolution of sensors has increased in recent years
On the other hand, in the zoom lens described in Patent Document 2, high optical performance is obtained over the entire zoom range by increasing the number of lenses in each lens group, but an even higher zoom magnification is required.
The present invention provides a full-length fixed zoom lens having a high zoom magnification and high optical performance over the entire zoom range.

Example 1