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 |
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