> > To me that would be an improvement that could be added in addition
> > to the 'green-button' kludge. It has the advantage of allowing
> > multi-segment metering, allows for changing light conditions, etc.
>
> Cory,
>
> There is no real benefit from this, in my experience. You can try this
> by shooting a cripple-mount film body with a pre-A lens (-50 or, I
> think -30, the -60 just does not fire). In that case, you need to
> explicitly dial in over/under exposure or set the ISO from the body.
> It was so unwieldy and error-prone that I ended up buying a -5n.
>
Of course it's academic since it's not an option with the current
firmware, but I don't think it would be too bad. The +-EV only works
within 3 EV from wide open, and even then you have to do the math of how
many stops you are from wide-open. With absolute numbers, it'd be easier.
My experience (most of my lenses are K/M) is that "changing" light (e.g.
high contrast areas and changing framing) happen quite often. Moreso than
changing aperture often times for me at least. The CW metering of K/M is
especially twitchy in those conditions (exacerbated by the split-prism
focus screen I've got installed).
I would also like to add that the GB-kludge could also be made to
work adaptively. Rather than FIX the Tv and Av, have it compute the
difference from wide-open to stopped down. Then keep the program meter
working as light changes. Then you only need to hit GB if you move the
aperture ring.
Lots of potential ways to hack around the fundamental problem.
-Cory
--
*************************************************************************
* Cory Papenfuss, Ph.D., PPSEL-IA *
* Electrical Engineering *
* Virginia Polytechnic Institute and State University *
*************************************************************************
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