FastPrimes
Optical calculator
Calculate framing, focal length equivalence, and depth of field from sensor size, focal length, aperture, and subject distance.
Enter the sensor size, focal length, aperture, and subject distance. Select metres or feet for distances.
The optical calculator returns focal length equivalence, angle of view, hyperfocal distance, and near and far focus limits.
Calculation source
The tool uses the sensor dimensions and circle of confusion constants in the site code. Angle of view uses 2 × atan(sensor size / (2 × focal length)). Hyperfocal distance uses focal length squared / (aperture × circle of confusion) + focal length.
These values estimate framing and focus. They do not measure lens sharpness.
Default example
Full Frame 36x24mm, 35 mm focal length, f/1.2 aperture, and 2.5 m subject distance.
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