Lens mounts

Flange distances, and which lens adapts to which camera.

What it is

The mount is how a lens attaches to a camera. Each one has a flange distance: from the mount to the sensor, in millimetres.

A lens adapts to a camera with a shorter flange distance: an adapter as thick as the difference keeps focus to infinity. That is why mirrorless cameras (16 to 20 mm) take almost any DSLR or cinema lens.
The other way round (a mirrorless lens on a DSLR) doesn’t work without optics in the adapter.
The format matters too: an APS-C lens on full frame gives dark corners (see Crop factor).
Autofocus and aperture control depend on the adapter’s electronics, not on the geometry.

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