full frame - Can I emulate a fullframe sensor with angular lens?

If I'd use a 30mm lens on a crop sensor, would it be like a fullframesensor with a 50mm on it? 30*1.6=48~50

Answer

We calculate a crop or magnification factor by finding the corner to corner measure of both formats and then divide. The full frame measures 24mm by 36mm. The diagonal measure of this rectangle is 43.3mm. The crop sensor measures 16mm by 24mm. The diagonal measure is 28.8mm. We divide 43.3/28.8 = 1.5. This is the factor that we will use. A 30mm on a crop sensor is the equivalent of 30 X 1.5 = 45mm on a full frame. Also 1/1.5 X 100 = 66%. This tells us that the crop sensor is 66% of the size of a full frame.