File:Back US2454686A (Zoomar, 1946).svg
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Summary
| Description |
English: Schematic of Back's varifocal lens (1946). Approximated from US Patent 2,454,686. |
| Date | |
| Source | Own work |
| Author | Mliu92 |
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 16:12, 1 May 2023 | | 600 × 350 (9 KB) | Mliu92 | Uploaded own work with UploadWizard |
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