Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP
Posting-Version: version B 2.10.1 6/24/83; site ttidcb.UUCP
Path: utzoo!watmath!clyde!bonnie!akgua!whuxlm!harpo!decvax!linus!philabs!ttidca!ttidcb!josephs
From: josephs@ttidcb.UUCP (Bill Josephs)
Newsgroups: net.rec.photo
Subject: aperture vs. shutter speed
Message-ID: <285@ttidcb.UUCP>
Date: Fri, 15-Feb-85 09:57:02 EST
Article-I.D.: ttidcb.285
Posted: Fri Feb 15 09:57:02 1985
Date-Received: Mon, 18-Feb-85 05:43:21 EST
Organization: TTI, Santa Monica, CA.
Lines: 18


     Another reason for aperture preferred priority (set aper-
ture, camera sets shutter speed) is for non-standard lenses whose
aperture cam (finger?? gizmo??) is handle lenses not as well made
as the manufacturer's.  With shutter speed preferred systems, the
gizmo in the lens must follow the gizmo in the camera quite accu-
rately with no hangup and with no glitches.  Also, its linearity
must be to same as standard lenses.  All this is unnecessary with
aperture preferred mechanisms since the lenses always stops down
as far as set on the barrel.  Now, with some of the more advanced
systems which do shutter preferred after the lens is stopped down
and might, then, set a different shutter speed than you specified
(but one that gets the exposure right), the issue becomes moot.
 

					Bill Josephs
					TTI
					Santa Monica, Ca.