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On 18/09/2012, Randy Lane wrote:

> Reminds me of one of the great historical debates about dedicated
> transparency scanners. Before going bankrupt, Polaroid made the only
> widely-distributed scanner that used diffused lighting from a bulb,
> whereas almost all others used LEDs.
> Microtek retained the rights to the Polaroid film scanners after the
> bankruptcy (I believe Microtek was the actual manufacturer to begin
> with, but I could be wrong), but the quality of the products dimished
> greatly and disappeared from the market in a hurry. The original
> Polaroids, I think particularly the SprinScan 120, are rare and
> expensive. Software and CCD improvements have largely diminished the
> harchness once very commonly blamed on LED lighting, so don't go ape
> looking for the Polaroid at tis juncture.
> 
My concern about either LED or fluorescent lighting is that the spectrum
is peaky, not smooth, and could interact with the film dyes and the
colour filters in the digital sensor to give unpredictable colour bias.

I would prefer either daylight or tungsten halogen with a blue
correcting filter.

Regards
-- 
Don Cox
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