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[filmscanners] Re: Scanning negs vs. slides

On Wed, 17 Apr 2002 08:58:20 -0400  Austin Franklin
(darkroom@ix.netcom.com) wrote:

> I don't believe those are one in the same...  Yes, the dye densities are
> higher with slides, but the noise is also higher in a slide (less
> discernability between tones), and therefore dynamic range lower.

All I can do is speculate, as I simply do not know enough. It seems logical
to me that the wider dye density range of slide should be able to better
resolve tonal nuances, albeit across a narrower range of subject
brightnesses. But that's guesswork.

Equally I don't see why it should have more noise - and can't quite see
what 'analogue' noise is anyway in terms of film grain, except the
deviation of individual grain sizes from the median, for any given level of
illumination. But I haven't a clue what the reality is, except that fast,
large grained emulsions are worse than slow, fine-grained ones.

All I've figured out is that, for myself, neg is immeasureably easier to
work with for the sort of photography I do.

Against that background, an argument about absolute capacity for tonal
discrimination is - well, just not all that important. I haven't looked
into it, as it has never presented itself as a problem that needs solving,
with neg.

However the loss of shadows and/or highlights with slide has presented
itself as a disastrous limitation on many occasions.

So my position is : if slide has or has not superior tonal resolution, I
don't care as neg's is more than good enough, and neg's capacity for
recording huge dynamic range is valuable to me where slides' intolerance is
a pain in the arse. Not very erudite, but practical.


Tony Sleep
http://www.halftone.co.uk - Online portfolio & exhibit; + film scanner info
& comparisons
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