Flange distance
A DSLR and a mirrorless camera in section: why the RF mount sits 24 mm nearer the sensor than EF, what the mirror box used that space for, and what lenses and adapters gain from it.
A DSLR and a mirrorless camera in section: why the RF mount sits 24 mm nearer the sensor than EF, what the mirror box used that space for, and what lenses and adapters gain from it.