Re: re:Unusual 3d Concept/ Light for Viewer

[P3D Greg Erker <erker@xxxxxxxxxxxxxx>]

>I'm still working on my 2 1/4 stereo viewer and have not found the perfect
>light source and transluscent material for it.  I tried 6 volt halogens, but
>their too dim. If I switch to 120v source, I'd have to use a large dimmer to
>control intensity instead of just a potentiometer. Thinner transluscent
>material gives me hot spots around the bulbs.

  My prototype viewer has one of George's 2.5V 0.8A frosted bulbs.
Using the spot meter in my Z-1p I found that it is about 1/3 as
bright as my Dr. T red button which has an unfrosted 0.8A halogen.

  My viewer uses 1/8" opal plexiglass for a diffuser located about
1" behind the slide. There are no hot spots but it is somewhat
brighter around the bulbs.

  When I build my final viewer I plan on using two of George's 0.5A
frosted bulbs located behind each slide image (and probably the same
diffuser). If not bright enough I will put in the 0.8A ones.

****

  I had considered using a 12V 20W halogen desk lamp. For about
$20 you get the bulb and the base containing a transformer. Some
of them even have a high/low switch.

  I would have disassembled the lamp and had a cable run between
the transformer box and the viewer.

  My biggest concern was the heat. Twenty watts inside a small
box could get very hot unless you make it out of aluminum and
put heatsinks on the outside :)

  I would also guess that it is also brighter than needed.

  BTW if anyone tries this and you burn down your house, don't
say I didn't warn you.


>Has anyone tried using fresnels ?
>The rest of the viewer functions fine, I've made a slide carrier that
>functions like a toaster, feeding from the top. The viewer raises from it's
>base to change the viewing angle. If anyone is interested in a copy of my
>drawing plan, I'd be happy to email them one.

  I'd like to see your plans. Do you have focusing or interocular
adjustments?

Thanks - Greg



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