Thats right, just look at Polaroids instant 35mm slide film. It's black! (I'm
assuming they still make it).
John
Chris Barker wrote:
> John
> You are right of course, but there is no answer to the implied requirement for
> built-in adjustment for reciprocity law failure - if films do vary
> significantly. We would have to buy a computer with a lens attachment to
> cater
> for the variety I suppose...
>
> Chris
>
> John Petrush wrote:
>
> > It could be that the SPD's low-light property is precise and predictable.
> > It certainly is useful if the low-light properties exactly match the
> > reciprocity characteristics of a particular film. But the fact is there is
> > a very broad range of reciprocity characteristics among the many brands and
> > types of film available. The SPD's low-light properties do not match all
> > films, and I'd be quite surprised if it matched any film. It just reduces
> > the amount of error. Close, but no cigar.
> >
> > Dealing with reciprocity failure is akin to dealing with color balance in
> > duplicating film - for critical applications testing with your specific
> > equipment and conditions is required and lots of mistakes are made. Ask any
> > astrophotographer.
> >
> > John P
> >
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>
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