[ATMoB-discuss] Day Star Filters

[Dan Winchell]

Hi Mike,

        #1  No, an IR blocking filter will not work the same as an energy
rejection filter.  Never use a Daystar filter without an ERF!
        #2  In my application I use the IR filter mounted on the front end
of the Barlow used to achieve an F30 focal ratio.  The reason I use an IR
filter is to protect the Daystar filter from degradation from the IR part of
the spectrum.  Over time the blocking filter in the Daystar filter will need
to be replaced if not protected from IR.  My understanding is that starting
about five years ago Daystar began incorporating an IR rejection to protect
the filters so an external IR filter was no longer necessary.

        -  Dan Winchell

----- Original Message ----- 
From: <noatak at aol.com>
To: <atmob-discuss at atmob.org>
Sent: Friday, July 27, 2007 11:42 AM
Subject: [ATMoB-discuss] Day Star Filters


>
> A?e-friend of mine from Bolivia has just acquired a T-Scanner Daystar
solar filter with an IR Blocking filter?and has asked me some questions as
to it's use which I cannot answer because I've never used one. If someone
could answer these questions I would appreciate it and will pass the
response along.
>
> Mike Hill
>
>
>
> 1.? Will an IR Blocking Filter work the same as an energy rejection filter
(ERF)
>
> 2. Where is the proper place to put the IR Blocking filter.
>
> Any general comments as to it's use would also be helpful but these were
the two questions posed in particular.
>
>
> Thanks for any replies.
>
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