Sigma patent: 14mm f/3.5 lens for APS-C mirrorless cameras

It's getting more and more interesting for mirrorless camera owners. Sigma filed a new patent for a 14mm f/3.5 lens for mirrorless cameras with APS-C sensors. According to the patent description this would be a zero-distortion lens, something we recently saw on a new Laowa lens.

Patent Publication No. 2016-139087

Published 2016.8.4

Filing date 2015.1.29

Example 1

INF 200mm

Focal length 13.98 13.28

F-number 3.53 3.54

Full angle of view 2ω 90.74 92.90

The image height Y 14.20 14.20

Overall length of the lens 89.25 89.25

BF 17.5750

Lens configuration 8 groups 10 sheets

2 aspherical three sides

ED 1 ( sigma in ELD)

Fluorite 4 ( sigma in FLD)

Example 2

INF 200mm

Focal length 13.97 13.28

F-number 4.13 4.13

Full angle of view 2ω 90.90 92.68

The image height Y 14.20 14.20

Overall length of the lens 82.60 82.60

BF 17.6874

Lens configuration 8 groups 10 sheets

2 aspherical three sides

ED 1 ( sigma in ELD)

Fluorite 4 ( sigma in FLD)

Sigma patents

FumakeTadashi

Inner focus (the second group)

[via Egami]
Source: Sigma patent: 14mm f/3.5 lens for APS-C mirrorless cameras