Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP Posting-Version: version B 2.10.1 6/24/83; site ritcv.UUCP Path: utzoo!watmath!clyde!burl!ulysses!mhuxl!houxm!houxz!vax135!floyd!cmcl2!seismo!rochester!ritcv!kar From: kar@ritcv.UUCP (Kenneth A. Reek) Newsgroups: net.rec.photo Subject: Re: lenses are sharpest at medium aperture Message-ID: <1087@ritcv.UUCP> Date: Tue, 12-Jun-84 09:59:48 EDT Article-I.D.: ritcv.1087 Posted: Tue Jun 12 09:59:48 1984 Date-Received: Wed, 13-Jun-84 02:03:57 EDT References: <697@decwrl.UUCP>, <287@tpvax.fluke.UUCP>, <2633@watcgl.UUCP> <757@hammer.UUCP> Organization: Rochester Institute of Technology, Rochester, NY Lines: 10 Try this if you have a grain focuser in your darkroom (aerial image variety please, not the ones that project onto a ground glass or other screen). Look at the grain while you adjust the aperature of your enlarging lens and you will see that at very small aperatures the grains get fuzzy. Large enlargement and unbearably grainy film like Tri-X help this to show up better. By the way, I've seen this through my EL-Nikkor 50mm lens whose optimum aperature is around f5.6. -- Ken Reek, Rochester Institute of Technology {allegra,seismo}!rochester!ritcv!kar