Speed Booster Calculator

Instantly calculate effective aperture

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Speed Booster Calculator is a free web utility for filmmakers and photographers. It instantly computes true effective aperture, 35mm full-frame equivalent focal length, and light transmission gains when adapting lenses with focal reducers (like Metabones or Viltrox). Supports MFT, APS-C, and Super 35 crop factors.

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Speed Booster Calculatorcalculate optical crop factor and effective aperture.
Sep 2026

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Joined Product HuntSeptember 29th, 2026

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23h ago

Speed Booster Calculator - calculate optical crop factor and effective aperture.

Speed Booster Calculator is a free web utility designed for filmmakers and photographers adapting full-frame lenses to crop-sensor bodies. It instantly computes effective aperture, light gain in stops, and full-frame equivalence as you type. Eliminate tedious manual math during kit planning, lens matching, and on-set configuration with this lightning-fast browser tool.