Subject: Re: THEFORGE digest 195

From: Randall Gray <[email-masked]>
Date: Thu, 23 May 96 09:21:43 EST

On Tue, 21 May 96 13:43:53 MDT,  Steve Smith <[email-masked]> wrote

> Thanks for your 2 cents. The piece I'm missing is what advantage does
> gold have? It seems like a welding lens gets you to the same place
> cheaper and more rugged.

As I understand, the gold plated lenses are the only beasties that
stop the IR (not sure if it is the near infra-red or far infra-red
that is in question).  The gold layer is (obviously) on a substrate
which may act to filter the UV.  I suppose they decided that solid
gold lenses were a little too effective. 

I recently bought a #10 gold filter here in Australia for $10.  That
would be about $8 US.  Not *that* pricey. Gonna have to make myself
some paper inserts to go between the cover and the filter though
... nice idea.

Of course your mileage may vary and I may be talking out of my hat.
Wish I were sniffing the black coke dust now ....

-- Randall

---

From: Steve Smith <[email-masked]>
Date: Thu, 23 May 96 8:46:48 MDT

Dear Randall,

> gold lenses were a little too effective. 

Not true as far as I understand. Welding glasses also stop IR. There
may be some differences in what wavelengths the two types of lenses
stop, though.

> some paper inserts to go between the cover and the filter though

Lots different from what I've heard--$40 US.

Thanks,
--
Steve Smith
[email-masked]