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Calculate depth of field from aperture, focal length, sensor size, and subject distance. See near and far focus limits for sharp photos.
Calculate correct exposure with the exposure triangle. Set ISO, aperture, and shutter speed for balanced photos in any lighting situation.
Calculate maximum print size from image resolution and DPI. Find the largest sharp print dimensions for photo paper, canvas, and wall art.
Crop factor is the ratio of a full-frame diagonal to your sensor diagonal. Multiply native focal length by crop factor to get 35mm equivalent focal length.
Crop factor = 43.3 mm / sensor diagonalTwo lenses on different formats match angle of view when their equivalent focal lengths are equal. A 50mm on full frame ≈ 33mm on APS-C (×1.5) ≈ 25mm on MFT (×2).
35mm equivalent = focal length × crop factorFull frame = 1×, APS-C Canon ≈ 1.6×, APS-C Nikon/Sony/Fuji ≈ 1.5×, Micro Four Thirds = 2×, 1-inch ≈ 2.7×, phones vary by model.
Equivalent FL = native FL × crop factorUpdated: July 2026
A 56mm f/1.2 on Fuji APS-C (×1.5) equals 84mm full-frame equivalent — classic portrait framing without buying an 85mm full-frame lens.
A 24–70mm full-frame zoom matches roughly 16–45mm on APS-C or 12–35mm on MFT for similar wide-to-normal coverage.
A 600mm on full frame equals 900mm equivalent on APS-C (×1.5), giving extra reach without a longer physical lens.
Aperture f-number is a physical property of the lens. Equivalence applies to field of view and often DOF for matched framing, not to exposure — f/2.8 always transmits the same light.
Fuji, Sony, Nikon, and Canon APS-C differ slightly. Select your exact format or enter sensor dimensions for accurate conversion.
Different sensor sizes change the field of view of a given focal length. This calculator converts between native focal lengths and 35mm full-frame equivalents using crop factor, so you can compare lenses across camera systems.