[filmscanners] RE: Scanning negs vs. slides

["michael shaffer" <michael@shaffer.net>]

Alex writes ...

> ..., I thought it would be worthwhile to check it out shooting
> similar images simultaneously on slides and negs,
> scan then on my IV ED and then to make final decision.
>

  For many subjects you may find very little difference.  Theoretically, any
difference with slides should be attributed to their optical density and the
possible number of f/stops.  Slides are usually attributed with an optical
density of not much more than '3', which limits the number of f/stops to
~10.  Negatives, on the other hand, are claimed to have the potential for
~14 f/stops.

  10 f/stops is a considerable amount of contrast, and should hardly ever
exceed normal subject matter, ... but you might run into problems achieving
shadow detail for a properly exposed sun-lit & snow-filled scene.

cheerios ... shAf  :o)
Avalon Peninsula, Newfoundland
www.micro-investigations.com (in progress)

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