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RE: filmscanners: LED Illumination for Film Scanners
> > > 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.
If blue LEDs were not available, outside the lab, as stated above, until 5
years ago, they why were there blue lenses available for LEDS in at least
the early 90's if they did nothing?
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