Focal Length Using Cropped Sensor Cameras When matching real-world camera shots/footage, I need to know whether the Focal Length in Blender represents the focal length set on the lens or the "true" focal length, taking into account a cropped sensor, e.g. Nikon DX.

For example, using my 50mm lens on my DX sensor bodies, the effective or "real" focal length of the images is actually 75mm because of the 1.5x factor.

Thanks.
Yes, I if you set the sensor size to the Nikon DX preset, the field of view should be the same as a real camera. The field of view is computed from the dimensions of the sensor and the length of the lens, as is in the real world.

A 75mm lens on a full sensor camera (24x36mm sensor size) would cover a field of view of 26.9 degrees.

A 50mm lens on an APS size sensor (23.6x15.8mm) would cover afield of view of 26.6 degrees.

Remember that the 1.5 factor in real life is "approximate". The exact match for a 75mm lens would be a 49.34mm lens.