Hi--

>Thanks very much for your reply.

You're welcome!

>In regard to indexing Velvia at either 40 or 32, I was under the impression
>that this would basically be overexposure. My reference to overexposing
>Velvia was made because if the film is normally rated at 50 and you shoot at
>32, your meter would have to tell you to open up wider or shoot slower in
>order get the 'right' exposure. Please let me know if I'm mixing terms and
>concepts.

No, you are right. But underexposure is generally regarded as resulting
in increased saturation (though I think it is hokey - it just resuts in
underexposed, dense slides).

>Also, if you do rate the film at 32, wouldn't you have to process at 32
>(pull). Some people have informed me to shoot at all different ratings and
>pick the one I like. I was under the impression that, at best, slide film
>has a 1/2 stop latitude. This approach may address discovering the proper EI
>for a particular batch of slide film ( since Velvia can very well fall into a
>range of 32-80, as I understand it), but this is not really what indexing
>is.

Right. Given the film/processing, one tries to accomodate the speed
rating to it that gives best exposure with your meter...
BTW, Velvia does seem to change speed with different predominant
strong colors (more toward 25 with bright red, toward 64/80 with
bright green).

>On b&w print such as TMAX 3200, you can rate it at 25,000, but you better
>push process it at 25,000 as well if you want to get any results. I believe
>this applies to slides as well.

Yes, though since exposure must be exact, slight shifts of ASA ratings
may be needed to accomodate mis-ratings, off-meters, or color speed shift
(or meter color reading error).

>Thanks, Bob. I look forward to your comments.
> Avedon8530@aol.com

You're welcome.
David Ruether