Lighting gels are not very thin, because they are mounted in front of
lights, not lenses.
The dye is "cast" into the material.
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----- Original Message -----
From: "Miroslav Pokorni" <mpokorni2000@...>
To: <TekScopes@...>; "Mark Anton" <heightstv@...>
Sent: Friday, March 05, 2004 3:07 AM
Subject: Re: [TekScopes] 475A filter, protective cap availability?
Hello Mark,
You did mention that lighting gel before, but I still do not understand
what
is that material and why musical instrument repair shops would have it.
I presume, the material is a gel with dye, deposited on transparent film,
something to be used to make custom photographic filters. The film must be
very thin, to avoid optical distortions due wavy surface caused by
mounting.
In that case, how you would make a 4 x 6" screen without film collapsing?
Please, explain the construction.
Regards
Miroslav Pokorni
----- Original Message -----
From: "Mark Anton" <heightstv@...>
To: <TekScopes@...>
Sent: Thursday, March 04, 2004 5:29 PM
Subject: RE: [TekScopes] 475A filter, protective cap availability?
I think i might have mentioned before on this list, an item that works
well
for a screen filter is lighting gel material. You can pick the
color....use
one that is close to the color of the trace. A musical intrument
repair
shop should possibly have some. The only to be careful of is not too
get
one that is too opaque. Then you would have to turn up intensity
farther
than needed to view the trace. I have used gel material on several
scopes
now and works well. It isnt just for looks either...the reason it is
there
is to provide a higher contrast trace. vs seeing a white background.
Maybe someone else might know of where you could get a cover.
Mark Anton, Owner
Heights TV & VCR Service
3946 Central Ave. NE
Columbia Heights MN, 55421
Phone is 763-789-1767
(area code formerly 612)
----Original Message Follows----
From: timothy.urban@...
To: <TekScopes@...>
Subject: [TekScopes] 475A filter, protective cap availability?
Date: Wed, 3 Mar 2004 08:21:34 -0500
Got a nice working 475A, would like to replace the original blue/green
CRT
filter with a nice sharp new one. Ar they commonly available?
Also need the protective cap that fits over the face of the scope - what
do these go for, and are there any better sources for them?
Thanks
Tim
N5IIT
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