U of S | Mailing List Archive | alt-photo-process-l | Re: Seeking: (1) orange LED safelight, (2) wire coating rod

Re: Seeking: (1) orange LED safelight, (2) wire coating rod

From: martinm <martinm@gawab.com>
Subject: Re: Seeking: (1) orange LED safelight, (2) wire coating rod
Date: Wed, 09 Apr 2008 09:38:35 +0200

> By the way their amber types (~590nm) are pretty
> monochromatic (bandwidth around 30nm or so).

I wanted to avoid that range, partly because 590nm may fog
high speed emulsions using a green sensitive dye. My OC
safelight certainly fogs emulsions using any of my ortho dyes.
I think something like 625nm with fairly narrow spectral
emission would be ideal because it can be used for two projects.

I actually looked at various LED manufacturers and I think I'm
going with Osram.

> You may try these:
> www.dynesonline.com/metering_rods.html
> www.sinotime.8k.com/photo.html
> www.rdspecialties.com/Page.asp?Script=1


The second link contained a wound rod with a handle (358.jpg)
which is pretty much what I'm looking for, except I want 316
stainless or at least something I know to be inert to the
emulsion... But at $30 a piece, I might try one first anyway.

> An alternative would be using threaded rods. As of now I've
> been unable to locate them, but there certainly exist PA-6,
> PTFE and other plastic threaded rods which could be easily
> cleaned.

Good idea! A threaded rod made from some hard polyamide or
fluoropolymer of low friction and good surface action
(wettability) would be ideal.

But do you think they are straight enough to coat glass plates?

Ryuji Suzuki
"The truth that I am seeking is in your missing file."
(Bob Dylan, Something's Burning Baby, 1985)