SensorExamples

Full frame sensor, 24mm

APS-C sensor, 24mm. 24X1.6= 38.4

Full frame sensor, 35mm focal length.

APS-C sensor, 35mm, 35x1.6= 56mm

Full frame sensor, 50mm focal length.

APS-C sensor, 50mm focal length, 50x1.6= 80mm

Full frame sensor, 70mm

APS-C sensor, 70mm focal length, 70x1.6= 112mm

Full frame, 100mm focal length.

APS-C sensor, 100mm focal length, 100x1.6= 160mm focal length

Full frame sensor, 135mm focal length

APS-C sensor, 135mm focal length, 135x1.6= 216mm focal length.

Full frame sensor, 200mm focal length.

APS-C sensor, 200mm focal length, 200x1.6= 320mm focal length.

Lens designed for APS-C sensor on a full frame camera. They make lenses specifically for the APS-C cameras to help with the wide angle problem, but those lenses can only be used on APS-C cameras. If you put a APS-C lens on a full frame camera, this is what happens. The APS-C camera will take any lens.