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Crop factor
Your lens on your sensor: full-frame equivalent, crop.
What it does
Your lens on your camera frames like which lens on full frame, the reference everyone uses? Type the focal length and the aperture, say what the lens is made for, pick your camera.
- Full-frame equivalent: focal length × crop factor (APS-C ×1.5, Micro 4/3 ×2, smartphone ×3.5). The aperture too, for the same depth of field: an 85 mm f/1.8 on APS-C frames like a 130 mm f/2.8 on full frame. For the light meter, f/1.8 stays f/1.8.
- On each sensor: the same lens on every format, to see what it becomes if you change cameras. Tap a line to make it your camera.
- Lens made for: the focal length never changes (a 35 mm stays a 35 mm), but an APS-C lens (E, RF-S, DX, EF-S, XF) projects a smaller picture, its image circle, drawn on the diagram. On full frame, the picture goes to the edge of the sensor: the corners are black (the orange frame shows what you see on screen). The camera’s crop mode (APS-C, Super 35: to turn on with most brands, automatic by default on Sony) avoids them: same framing as on APS-C, fewer pixels. A full-frame lens (FE, RF, Z, EF, L) also covers APS-C.
Sensor sizes are common values: each brand and camera varies a little (Super 35 most of all). For an exact one, pick Custom.
Free, no account, nothing is sent: it runs in your browser, even offline.
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