> No, there's a good reason for it: The matrix metering algorithms need
> to know not only the maximum aperture of the lens (which it gets from
> the ID Insulators, but also the actual shooting aperture, which it can
> determine from the non-linear movement of the diaphragm actuator arm on
> "A Series" and later lenses.
>
Ah... my bad. The cause/effect is a bit off though, no? The
non-linear movement of the diagphram arm is what the *body decides* to do
if A or later. The shooting aperture is determined from the aperture
simulator in K/M/A-in-non-A.
I still say the "green-button" trick could be made to work better
and allow these things, even without the aperture simulator. If one could
manually set the max aperture of a K/M lens, the body would know. Hitting
the green button could then be used to compute the *difference* between
wide-open and shooting. Then you'd only have to hit the button if you
change the lens aperture... not if the lighting changes.
-Cory
--
*************************************************************************
* Cory Papenfuss, Ph.D., PPSEL-IA *
* Electrical Engineering *
* Virginia Polytechnic Institute and State University *
*************************************************************************
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