Sigma New Patent filed for ultra-wide 14mm APS-C Mirrorless camera, take a look at the patent details below
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)
source – egami.blog.so-net.ne.jp
