I saw this quiz put up on a different forum, and found it to be very educational. I thought I would reproduce it here. Assume you take the following four photographs: A) Full-frame camera with 300mm lens B) 1.5x crop camera with 200mm lens, shot from the same distance as A C) Full Frame camera with 200mm lens taken at 2/3rds the distance as photo A D) 1.5x crop camera with 300mm lens, taken at 3/2 the distance as photo A For the purposes of this quiz, ignore any depth-of-field issues. Assume adequate depth of field for both subject and background in all cases. Now, the quiz- which photo(s) have the same perspective? Edit: if you know the answer, please do not write the explanation, simply vote your choice. I will put the answer up after a few days of voting.