Digital BW, The Print

On 03/23/2012 03:10 PM, faeofavalon wrote:
> Ernst,
> I will try what you said about masking it first. I neglected to mention
> the most important thing - the negatives are overexposed (simply because
> my Holga was set to "Bulb" without my knowledge!) so they are dense.
> HOWEVER, I can see through them when held up to light so the information
> is there.
>
> On another subject, yes I do scan directly onto the glass but I never
> seemed to have a focus problem. Is using the mediocre film holders that
> Epson gives me, advantageous to focus?
>
> AnnMarie

Depends, the Epson Perfection scanner models have no active focusing in 
the scanner, it is a fixed focus design and not perfect. One 4990 may 
have the focus on the glass bed, the other one 3 mm above the bed. In 
theory the best focus should be halfway the height between the film 
plane in the holders and the glass bed but the deviations are way beyond 
that. Much is compensated by the wide DOF of the lens system but there 
is something to gain there by adjusting the film holders. See this 
article written 8 years ago on the 2450 model:
http://www.normankoren.com/Tutorials/Epson_flatbeds.html

If you want to include the frame edges there is the problem that little 
film surface is left for keeping the film flat in any holder. If you 
also want to reduce Newton rings etc that would occur in using glass in 
contact with the film then there is only one solution that really keeps 
the film plane and avoids Newton rings without loss of detail etc: wet 
mounting. Doug Fisher makes custom wet mount holders and has some docs 
on how to use them, There must be something I wrote among them. Doug's 
holder has also adjustable nylon screws to get best focus. He has more 
holder types too including anti-newton glass inserts.
http://www.betterscanning.com/


-- 
Met vriendelijke groeten,   Ernst

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