Does this mean if you removed or filed off the aperture actuator lever from the k/m lenses so the aperture would remained closed all the time (thus turning them into manual lenses), you could get metering and AE on the *istD with these butchered lenses?
JCO ---------------------------------------------------------------------------- J.C. O'Connell mailto:[EMAIL PROTECTED] http://jcoconnell.com ---------------------------------------------------------------------------- -----Original Message----- From: Mark Roberts [mailto:[EMAIL PROTECTED] Sent: Saturday, October 11, 2003 10:48 AM To: [EMAIL PROTECTED] Subject: Re: Stupid question about M lens on *ist Steve Desjardins wrote: > > Stupid question. I've read that an M lens on the *ist will only meter > wide open. If the camera can't talk to the lens, how does it know what > wide open is? and if its reading the light coming through the lens, why > won't stopping down affect metering? Probably an obvious answer, but I > can't see it. With an M lens there's no digital data being sent from the lens to the camera (obviously) so the camera doesn't "know" what wide open is, it just meters whatever light is coming through the lens to the focusing screen. With standard M and K lenses, this is wide open, because the aperture lever is holding the lens diaphragm open. (With stop-down lenses like the 28mm shift, it's the aperture to which the lens is actually set.) -- Mark Roberts Photography and writing www.robertstech.com
