Sigma 14mm f/1.4, 14mm f/1.8, 12mm f/1.4, 10mm f/1.4 APS-C Patent Applications Found

By Louis Ferreira | Published: January 25, 2024

Sigma has filed some patents for some interesting APS-C lenses which you can check out below:

Overview

[Publication number] P2024011096
[Release date] 2024-01-25
[Name of the invention] Imaging optical system
[Application date] 2022-07-14
[Applicant]
[Identification number] 000131326
[Name] Sigma Co., Ltd.
[Problem] Suitable for mirrorless digital cameras and video lenses, with the refractive power of each group appropriately arranged to effectively correct various aberrations, angle of view exceeding 100 degrees, and F-number. We provide a retrofocus type wide-angle lens with a large aperture ratio that is bright and has an aperture ratio of less than 2.0.
BACKGROUND ART
[0002]
As a wide-angle lens, a retrofocus type imaging optical system is known in which a negative lens group is arranged on the object side and a positive lens group is arranged on the image side. Retrofocus type imaging optical systems can easily ensure back focus relative to the focal length, and are widely adopted as optical systems used in imaging devices such as digital cameras and video cameras.
[0012]
The present invention is suitable for mirrorless digital cameras and video lenses, in which various aberrations are well corrected by appropriately arranging the refractive power of each group, and the angle of view exceeds 100 degrees. , a retrofocus type wide-angle lens with a large aperture ratio, which is bright with an F value of less than 2.0.

Example 1

Focal length: 14.44
F value: 1.44
Angle of view: 115.23
Image height: 21.63
Total length: 155.19

Example 3

Focal length: 14.44
F value: 1.85
Angle of view: 114.58
Image height: 21.63
Total length: 130.82

Example 4

Focal length: 12.36
F value: 1.44
Half angle of view: 122.40
Image height: 21.63
Total length: 154.98

Example 5

Focal length: 10.30
F value: 1.47
Half angle of view: 108.80
Image height: 14.20
Total length: 111.32

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