Clarification:
Each thickness of translucent plexiglas is calculated to transfer the same
amount of light. There has to be lightloss in the diffusing but it is the
same for 1/2" translucent plex as it is for 1/8" (I got this from my Plexi
source and gurua of plastics Dick & brother Bill at Plastic Mart (in West
Los Angeles on Pico just east of the Santa Monica Freeway).
Now if you take a 1/2" piece and grind it down to 1/4" you will get some
greater amount of light than at the center. It will also be greater than
that from a piece of unaltered 1/4" translucent Plex. I don't know how much.
I got the idea from Bessler which does this in my old color lamp head (circa
1979). I haven't tried it.
---William Nettles
[EMAIL PROTECTED]
Nettles Photo / Imaging Site http://www.wgn.net/~nettles
> From: [EMAIL PROTECTED]
> Reply-To: [EMAIL PROTECTED]
> Date: Fri, 20 Jul 2001 12:11:41 -0600
> To: [EMAIL PROTECTED]
> Subject: Cameramakers digest, Vol 1 #164 - 3 msgs
>
> On Thu, 19 Jul 2001, William Nettles wrote:
>
>> Trans lucent plex for light boxes transmits the same amount of light
>> regardless of the thickness. so use the thickest plex you can afford.
>>
>> Also a trick of the enlarger light manufacturers is to taper the thickness
>> of the diffusion near the edges.
>
> OK, I'm confused. The way I read the first sentence it sounds like you
> are implying that there is basically no loss in the Plexiglass, and that
> thick Plexiglass "transmitts the same amount of light" as thinner
> stock. Then in the next sentence you talk about modifying the thickness
> of the Plexiglass to adjust the amount of light transmitted. Could you
> please clarify?
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