Ýzzet <izzet@vizo.com> writes: > Assume I have a 35 mm. SLR with a 28 mm. lens on it. I am looking though > the viewfinder to the subject. Then I change the lens to a 300 mm, and > look at the same subject from the same distance. Now the subject is > filling more of my view and also seems magnified. > 1- Is the reason for that magnification ONLY the decreased > field-of-view? Or is the decreased field-of-view simply a consequence of the greater magnification? Same thing either way. > 2- If this is so, do I get the same image if I use a > a)300 mm. tele and print full-frame to an 8*10 card, > b)100 mm. tele and print full-frame to a 24*30 (if it exists) and then > crop to an 8*10? Yes, you'll get exactly the same object sizes and object relationships. (As a thought experiment the pictures will be "identical"; in the real world the greater magnification will make grain and things look different in them, but the *images* in so far as you can see them past those artifacts will be identical.) This is in fact the classic test that demonstrates that position, rather than focal length, is what determines perspective in a photograph. -- David Dyer-Bennet, dd-b@dd-b.net / http://www.dd-b.net/dd-b/ John Dyer-Bennet 1915-2002 Memorial Site http://john.dyer-bennet.net Dragaera mailing lists, see http://dragaera.info
