I have a 50mm lens. Just wondering if I want to simulate a 100mm lens, I just zoom it to 200%? If I want to simulate a 500mm lens, I just zoom it to 100%? The field of view will be different.
Thanks for the link. But I choose the 90mm lens, print screen then zoom 200% and compare with the 180mm lens. The result is they are different. The 180mm lens seem to have bigger dimension, holding everything constant.