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RE: filmscanners: LED Illumination for Film Scanners



darkroom@ix.netcom.com (Austin Franklin) wrote:

> > > LEDs have been around for a very long time, and they are reasonably
> > > inexpensive, as well as very easy to control.  I am sure that
> > if this was
> > > such a great idea, and the implementation worked near as well as you
> > > believe, it would have been done some 15-20 years ago as a 
> > > commercial
> > > venture, but, alas, it wasn't.
> >
> >
> > An LED light source for enlargers was not done 15-20 years ago 
> > because it
> > was not possible. Blue LED's did not exist as anything other than
> > laboratory
> > curiosities until within the last 5 years.
> 
> Sure you could have done that 15-20 years ago.  Use filters...red, 
> green and
> blue filters certainly were around 15-20 years ago.

LEDs are monochromatic light sources and can't be filtered to another 
colour.




 




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