Aetna Actinar 135/4.5
German-made all-silver lens marked with red Double-H, distributed by Aetna Optix (later BKA) for Exakta bellows mount. Also fitted to Mirrorscope. Perhaps made by Steinheil.
| Dimensions | 135 mm |
|---|---|
| Focal Length (mm) | 135 |
| Max Aperture (f) | 4.5 |
| Min Aperture (f) | 32 |
| Rear Mount | Exakta, M42 |
| Production | 60084, 60099 |
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