> My impression of a TC (I don't know if I'm right), is > that it takes the middle portion of the image formed > by whatever lens it's attached to, and magnifies that > portion. . . . . > > That being the case, wouldn't the "100mm f2.8" lens > have the same DOF as the original 50mm f1.4? No. The TC not only multiplies the image size - it multiplies the 'fuzziness'. Something that is sharp enough to be considered in focus in the original image may well be classified as out-of- focus in the magnified image. (i.e. the TC also magnifies the circle of confusion) -- John Francis . . . . . . . . . . (650) 429-4427 MyWay.com 444 Castro St. Suite 101, Mt. View, CA 94041 Hello. My name is Darth Vader. I am your Father. Prepare to die. - This message is from the Pentax-Discuss Mail List. To unsubscribe, go to http://www.pdml.net and follow the directions. Don't forget to visit the Pentax Users' Gallery at http://pug.komkon.org .
