Sigma 300mm f/2.8 DG DN, Sigma 200mm f/1.8, and Sigma 250mm f/2 Patents Found

Sigma as a 300mm f/2.8 DG DN coming that will support ta 1.4x TC. You can read about the patent below.

  • [Publication number: publication number]
    Japanese Patent Application Laid-Open No. 2020-170066 (P2020-170066A)
  • [Release date release date
    October 15, 2020 oct 15 2020
  • [Name of the Invention]
    Rear conversion lens
  • [Application date]
    April 2, 2019 Apr 2 2019
  • [Applicant applicant]
    [Identification number] 000131326
    [Name or name]
    Sigma Corporation
  • PROBLEM TO
    BE SOLVED: To provide a rear conversion lens having a short flange back, corresponding to a mirrorless camera system having a large image pickup element, and having a small size and high imaging performance.
    Compact rear conversion lens with high imaging performance for mirrorless camera systems with a short flange back and large image sensor.

Example 1 Example 1

ML CL
Focal length 290.00 403.05
F value 2.91 4.04
Angle of view 8.38 6.10
Image height 21.63 21.63
full length 245.40 262.46
BF 36.00 17.40


There were also Sigma 200mm f/1.8 and Sigma 250mm f/2 patents found and the 250mm f/2 can act as a 500mm f/4 with a 2xTC.

  • [Publication number] Japanese Patent Application Laid-Open No. 2020-160100 (P2020-160100A)
  • [Publication date] October 1, 2020
  • [Title of Invention] Imaging Optical System
  • [Application date] March 25, 2019
  • [Applicant]
    [Identification number] 000131326
    [Name or name] Sigma Co., Ltd.
  • PROBLEM TO BE SOLVED: To provide an imaging optical system which can be used as a large-diameter telephoto lens in which various aberrations are satisfactorily corrected while achieving small size and light weight.
Example 1 Example 2 Example 3
Focal length 195.60 178.98 225.46
F value 1.84 1.84 2.02
Half angle of view 12.56 13.71 10.91
Image height 21.63 21.63 21.63
full length 239.82 232.10 257.29
BF 54.111 54.3633 55.2054
Example 4 Example 5 Example 6
Focal length 244.97
F value 2.02
Half angle of view 10.04
Image height 21.63
full length 264.35
BF 54.7628

Follow SonyAddict on FacebookTwitterInstagram, and YouTube

Plus our owners’ groups
Sony a9 Owners Group
Sony a7 Owners Group

via asobinet 1, 2

This entry was posted in Patents and tagged , , , , , , , , . Bookmark the permalink. Trackbacks are closed, but you can post a comment.