Voigtlander 25mm f/2, 75mm f/1.8, 135mm f/2, and 135mm f/1.2 Patents Found

Cosina’s patent application was published on March 18, 2021. There are some examples such as “APO-LANTHAR 50mm F2”, but some of them are interesting such as “135mm F2” and “135mm F1.2”.

  • [Publication Number] Japanese Patent Application Laid-Open No. 2021-43376 (P2021-43376A)
  • [Publication date] March 18, 2021
  • [Application date] September 12, 2019
  • [Title of Invention] Imaging Optical System
  • [Applicant]
    [Identification number] 391044915
    [Name or name] Cosina Co., Ltd.
  • PROBLEM TO BE SOLVED: To obtain a bright interchangeable lens which reduces fluctuations of various aberrations in the entire shooting distance range from a distance to a near distance and stabilizes them, and which covers sufficient optical performance in a shooting lens in a wide-angle range to a medium telephoto range. ..
Example 1 Example 2
Focal length 40.00 36.01
F value 1.97 1.23
Half angle of view 28.4 31.4
Example 4 Example 5
Focal length 51.14 49.28
F value 1.26 1.93
Half angle of view 22.9 23.7
Example 9 Example 10
Focal length 73.00 134.00
F value 1.73 2.03
Half angle of view 16.5 9.17
Example 12 Example 11
Focal length 25.80 134.00
F value 1.86 1.20
Half angle of view 39.9 9.17

via asobinet

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