Wide-angle lenses with compact, lightweight, high magnification, and excellent optical performance, including examples of Canon's 12mm F2.8, 15mm F2, and 15mm F2.8, which have a maximum magnification of 0.25 to 0.5x. We have applied for a patent on our technology.
Applicant: Canon Inc.
Publication number: P2023104029
Application number: P 2022004774
Publication date: 2023-07-28
A wide-angle compact and lightweight lens which is capable of high magnification. To obtain a high magnification at, it is necessary to increase the amount of movement of the focus lens group, which makes it difficult to reduce the size of the entire lens. In order to reduce the amount of movement of the focus lens group, it is necessary to increase the refractive power of the focus lens group.
Example 1: 15mm f/2.8
Focal length 14.83
F value 2.91
Half angle of view 52.03
Image height 19.00
Overall length 105.19
Back focus 10.83
Magnification ∞ -0.5
Example 2: 15mm F2
Focal length 14.70
F value 2.06
Half angle of view 52.27
Image height 19.00
Overall length 110.00
Back focus 12.16
Magnification ∞ -0.25
Example 3: 12mm F2.8
Focal length 12.47
F value 2.83
Half angle of view 56.72
Image height 19.00
Overall length 90.60
Back focus 10.19
Magnification ∞-0.25
