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.

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Dimensions 135 mm
Focal Length (mm)

Max Aperture (f)

Min Aperture (f)

Rear Mount

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