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[filmscanners] Re:digitising slides


  • To: lexa@lexa.ru
  • Subject: [filmscanners] Re:digitising slides
  • From: "Op's" <martin@wollongong.apana.org.au>
  • Date: Sat, 26 Apr 2003 23:50:22 +1000
  • References: <200304260141.LAA09850@wollongong.apana.org.au>
  • Unsubscribe: mailto:listserver@halftone.co.uk

Thanks Jack and Paul
>
> Guten Tag Rob!
> As a matter of fact our chief scientist has done just that.
>
> Here is an excerpt from someone asking a similar question on another forum:
>

 > I use this to scan slides.  I have the D100 set to bracket three
 >exposures
 >at the widest range, and a Bessler colorhead with diffuse illumination.



>
> I've never tried photographing slides with a digicam, but given that a film
> scanner uses a linear sensor while a camera uses a 2D sensor with Bayer
> interpolation, the camera is bound to do an inferior job. The noise level
> will also be much higher in the digicam--they typically only have about six
> bits of S/N ratio.
>

Both replies make sense and the work around looks practical.

I would have thought that using a colour head might effect the
sensitivity range on a digital camera sensor  but obviously this has
been balanced out to overcome the problem. And in referring Pauls reply
the bracketing has been done to overcome the S/N ratio (I may be wrong here)

Its obvious I need a Digital camera with a histogram output.  I can set
  a camera up on a Bowens slide copier. Maybe Ill go buy a D100 next
week and report back on the results.

Thanks once again.

Rob



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