RE: filmscanners: Magnification of light - AND brief density math lesson...

["Austin Franklin" <darkroom@ix.netcom.com>]

> [rafe b:]
> >> And BTW, when Austin talks about 5080 dpi from 35 mm film,
> >> he probably should have mentioned that it takes about an hour
> >> or so to produce that scan, in RGB.  I hope you're not in
> >> a hurry. <g>
>
> [Austin:]
> >That's not entirely true.  It depends on the exposure time, and
> how new the
> >bulb is.  If you set exposure to min, it will scan in around %20
> the time.
> >
> >B&W is single pass, and can use min exposure, so it is really
> comparable to
> >the newer scanners in terms of scan time.
>
>
> I'm afraid I don't understand.  Doesn't the proper exposure
> depend on the image under consideration?

No.  More so the film.  The image data only spans a small part of the 16 bit
range.  Increasing exposure time only incureases DMax.