Kostas Kavoussanakis <[EMAIL PROTECTED]> wrote: >On Mon, 19 Sep 2005, Mark Roberts wrote: > >> Between the mechanical linkage and the potentiometer, it also introduces >> two more potential points of failure. > >How often have these failed in the past?
I've seen several, and those are from the days when the aperture was set from the lens, so the potentiometer contacts were moved often. If the potentiometer is left in one position all the time, as it will be when most or all of the lenses one owns are left on the "A" setting, failure will be much *more* common: Potentiometers like to be swept across their full range of motion occasionally to keep the contacts clean. I hadn't thought about all this until my previous post on the subject but I suspect this is a *major* reason why Pentax has eliminated this part. -- Mark Roberts Photography and writing www.robertstech.com
