New Patents for Sigma 70mm f/2.8, 90mm f/2.8, and 100mm f/2.8 compact mirrorless lenses have been found. The Sigma 90mm has already been announced.
Sigma 90mm f/2.8 DG DN | Contemporary: B&H Photo / Amazon / Adorama
- Applicant: Sigma Co., Ltd.
Publication number: P2022061515
Application number: P 2020169465
Publication date: 2022-04-19 Title
of invention: Imaging optical system - PROBLEM TO BE SOLVED: To provide a compact imaging optical system having a quiet and rapid focus in which various aberrations are well corrected in a lens for a digital camera or a video.
- In recent years, there is an image pickup device in which the mirror portion is removed to shorten the distance between the image pickup optical system and the image pickup element.
- Among them, a large-sized image pickup device and a miniaturized image pickup device are widely used. In contrast to the miniaturized image pickup apparatus, the imaging optical system is also required to be miniaturized in overall length and outer diameter.
- According to the present invention, it is possible to obtain a compact imaging optical system having a quiet and rapid focus in which various aberrations are well corrected in a digital camera or a lens for video.
Example 4 (70mm F2.8)
Infinity Shortest shooting distance
Focal length 72.10 66.91
F number 2.90 2.90 Full angle of
view 2ω 31.67 31.76
Image height Y 21.63 21.63
Lens total length 70.44 70.44
Example 5 (100mm F2.8)
Infinity Shortest shooting distance
Focal length 102.00 93.47
F number 2.90 2.89
Full angle of view 2ω 22.67 22.83
Image height Y 21.63 21.63
Lens total length 87.72 87.72
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