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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