File:Bertele US1988704A (Sonnar f2, 1931).svg
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Summary
| Description | English: Dr Ludwig Bertele's Sonnar design (1931), with a maximum aperture of f/2, redrawn from geometry listed in US Patent 1,988,704. |
| Date | |
| Source | Own work |
| Author | Mliu92 |
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 14:57, 21 March 2023 | | 620 × 700 (2 KB) | Mliu92 | Uploaded own work with UploadWizard |
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