[filmscanners] Re: Better DOF than Nikon?

["Arthur Entlich" <artistic-1@shaw.ca>]

I will try taking some reject slides or dupes and create a warp of
similar magnitude and see how the scanners respond.  I may have to turn
off autofocus.  This will take me several days to get to, I'm afraid.

Art

Paul D. DeRocco wrote:

>>From: Arthur Entlich
>>
>>Well, that's hard to say without knowing the extent of the ripples and
>>which model scanner you are considering.
>>
>>How much distance are we speaking about between the upper most and
>>deepest ripple?  Are we speaking of potato chip ripples or what? ;-)
>>
>>I have a Minolta Dimage Dual II and a Polaroid SS 4000+, and if you give
>>me some dimensions, I can try to replicate it and see what they can do
>>with it.  Also, have you tried to remount the slides to see if they can
>>be made to lie more flat?
>
>
> It's hard to measure, but just eyeballing it, I'd say that I have easily a
> millimeter of warpage on some of them. And it's not necessarily a smooth
> domed curve from one edge to the other--some slides have ripples down one
> edge. (Although a simple curve of sufficient magnitude would be an adequate
> DOF test.)
>
> I've remounted slides in anti-Newton glass mounts, and got somewhat better
> focus, but noticeable grain from the glass. However, there are two problems
> with remounting. First, it's extremely time-consuming. Second, some of the
> slides have ripples in them that even glass sandwiches won't take out. I
> really think that increased DOF is the only way I'll ever get decent files
> out of these.
>
> --
>
> Ciao,               Paul D. DeRocco
> Paul                mailto:pderocco@ix.netcom.com
>

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