RE: filmscanners: LED Illumination for Film Scanners

[Cliff Ober]

Austin,

That message was somehow delayed in the system for many hours...

What company made those filters? - I'd like to look up the details (I have
an extensive electronics data library going back about thirty years that
includes a very large amount of optoelectronics).

Cliff Ober

-----Original Message-----
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED]]On Behalf Of Austin Franklin
Sent: Thursday, June 21, 2001 5:25 PM
To: [EMAIL PROTECTED]
Subject: RE: filmscanners: LED Illumination for Film Scanners



> >> Sure you could have done that 15-20 years ago.
> >> Use filters...red, green and blue filters
> >> certainly were around 15-20 years ago.
>
> HUH???  Please explain to me how to filter monochromatic red light from an
> LED to get blue light. If you can figure out how do that you'll
> be up for a
> Nobel prize in physics.

I did post a correction to this yesterday, saying I was thinking of clear
LEDS, but that is not the emitter color, so it wouldn't work as I
expected...BUT...I have brochures from back in the mid 80's that offer
filters for LEDs...in varying colors, and one of the colors IS blue.