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Re: (IAAC) IR bandpass filters



--- Lew Gramer <dedalus@latrade.com> wrote:
> 
> Someone on a local Club e-list asked a question regarding special
high
> transmittance filters - basically, more "customized" versions of the
> well-known UHC, OIII, etc. filters. I believe the poster was an
> astro-imager, but thought this may be of interest to visual         
> observers, too.
> 
> Note that such filters are generally NOT inexpensive! Clear skies,
> 
> Lew Gramer
Hi Lew,
You might also consider bandpass interference filters from Andover
Corporation [standard disclaimer -- I have no personal connection]. 
http://www.andcorp.com/Web_store/Standard_BP/Std_BP_General.html
They offer a 50mm Hydrogen Alpha filter, for example, for $186 --
Lumicon's price range. 
http://www.andcorp.com/cgi-bin/Shopper.exe?key=656FS10-50&preadd=action
Filters are available for all parts of the spectrum; take your pick!
Clear skies,
Tom
=====
Thomas O'Hara, PhD
San Diego, California, USA
thomasohara@yahoo.com
"O Memory! thou midway world Twixt earth and Paradise, 
Where things decayed and loved ones lost 
In dreamy shadows rise."  -- Abraham Lincoln, 1844, Age 35
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