Re: Lens system design help needed
From: Brian B (kingsway.mansions_at_virgin.net)
Date: 07/24/04
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Date: Sat, 24 Jul 2004 21:32:38 GMT
"NO BODY" <fromhertoeternity3000REMOVETHIS@yahoo.ca> wrote in message <...>
> 1. Mix the three light beams in order to get an even white light.
Project all three beams on to a circular diffuser 50 mm diameter - "opal
glass" or frosted glass or acrylic.
Put an iris diaphragm to vary the diameter. Maybe a Fresnel in contact to
direct the light onto the projection lens.
> 2. To magnify this beam in size (from originally approx. 50mm to 20
> inches)
Try two plano-vex lenses nose-to-nose.
> 3. be able to maintain this 20 inch spot, while changing the focal
> length (between 3-15+ feet).
Adjust iris diaphragm diameter as you vary the lens distance.
This will be much cheaper than a zoom lens, and is less likely to vary so
much in illumination level.
>
<...>
> Regards
>
> Oliver
>
Brian Blandford
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