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RE: filmscanners: What causes this and is there any easy solution ?


I was responding to someone else's message with some general comments on why
they might not see grain when they project a slide at 40 inches x whatever
but find that the grain becomes very noticable when they scan the slide at
4000 dpi.  A poor lens might also contribute to masking grain structure in
the original; but at the sizes the poster was talking about, it would have
to be a very poor but unusal lens to mask the grain to the extent that it
would not be noticable without the poster seeing a similar deterioration in
the image.  Lenses of poor or high quality do not selectively mask grain
only. :-)

-----Original Message-----
From: owner-filmscanners@halftone.co.uk
[mailto:owner-filmscanners@halftone.co.uk]On Behalf Of John Matturri
Sent: Saturday, May 12, 2001 11:24 AM
To: filmscanners@halftone.co.uk
Subject: Re: filmscanners: What causes this and is there any easy
solution ?

> While there maybe some merit to your comments about dust in the air
> flaws in the slide being projected, I had the actual surface texture of
> projection screen in mind as well as the actual viewing distance
> of any dust.

Haven't been following this thread all that closely so this may have
been covered. But what lens are you using for your projections? If it is
a lens supplied with most projectors the poor quality might be a masking
factor. The difference between one of these lenses and a Buhl or similar
projection lens is pretty substantial.


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