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Digital BW, The Print

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Diffusion sheet in scanner (was Re: 40" Print, How many Megapixels?)

2005-12-23 by Paul Roark

> ... it will be  difficult and
> expensive to beat Tech Pan if that is your standard.

Yes.

Along those lines, I'm trying to maximize the scanned quality of the closest
alternative films to Tech Pan.  Grain seems to be the hardest TP quality to
match.   

In enlarging, a diffusion enlarger was generally felt to hide the grain
better than a condenser (or worse, point source) enlarger.  Some have
claimed there is a similar effect in scanning.

So, the question is, will a diffusion screen in the light path of a Nikon
8000 tend to hike film grain.

I tried a standard Kodak diffusion sheet, but it may have been too course.
It at best did nothing.

In that past, when I've needed a high resolution substitute view screen for
a camera I've found frosted adhesive tape on glass makes an excellent view
screen.  It has a very fine frosting on it.

With a piece of tape over the glass carrier, I may be seeing the effect of
reducing the grain.  However, the tape itself and how it adheres to a
surface is too uneven to be sure.  Further experiments along these lines is
definitely warranted.  So ...

Question:  is there a source of super-fine-grained diffusion sheets that
might be tested for this application?

Paul
www.PaulRoark.com

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