Re: IR filters from Edmund Scientific

["phillip geller" <filje@xxxxxxxxxxx>]

----- Original Message ----- 
From: "Tom Purdum" <javaboyone@xxxxxxxxx>
To: "IR List" <INFRARED@xxxxx>
Sent: Tuesday, January 02, 2001 12:42 AM
Subject: IR filters from Edmund Scientific


> Has anyone ordered any IR filters from Edmund
> Scientific?  They profess to be optical grade and the
> price looks pretty good as well.  They list a 4 x 5
> plastic filter (thick like a cokin) for $17.00.  It
> also looks like transmission is from around 650nm.  I
> could be reading this catalog all wrong but...
> 
> Any feedback would be great.  I thought I might order
> one anyways for the heck of it.  Besides, they sell
> fresnell lenses (anybody for setting the pavement on
> fire?)
> 
> -Tom Purdum

I have  one, the optical quality is good.
The response is something like an 89b.
You can see through it because it leaks some light in the
green part of the spectrum. If you sandwich a 25 R with it
it looks just like an 89b. If you are going to cut it down, be careful,
they are kind of brittle. The Red filter of the same material is
more like a 29 than a 25

Phil 


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