Re: (IAAC) IR bandpass filters

--- Lew Gramer <dedalus@latrade.com> wrote:
> Someone on a local Club e-list asked a question regarding special
> 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]. 


They offer a 50mm Hydrogen Alpha filter, for example, for $186 --
Lumicon's price range. 


Filters are available for all parts of the spectrum; take your pick!

Clear skies,


Thomas O'Hara, PhD
San Diego, California, USA

"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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