Re: [APML] Prime focus filters

["GARY HATFIELD" <Starmangmh@msn.com>]

Thanks for the info Bill! 

 

Gary

----- Original Message -----

From: William R. Mattil

To: Discussion of Film Astrophotography

Sent: Saturday, February 05, 2005 9:16 AM

Subject: Re: [APML] Prime focus filters

GARY HATFIELD wrote:

> Hi Michael,
>     I've never used one but I've heard the Lumicon Deep Sky filter is
> good for AP.  As for size, it depends on what size adapter you're
> using, 2" or 1.25".  I'm sure others on the list can give you more
> info.  Good luck!
> 


Gary,


I have a couple of 1 hour images of M51 that were taken with the Lumicon
Filter (e200) and there is a distinct purple cast to it. Very annoying
actually. Shorter exposures of Ha regions don't exhibit this behavior
probably because the narrow band emission as opposed to the broadband
emission for galaxies.

Concensus on this list was that the Hutech filter is a better choice.


Regards

Bill

--

William R. Mattil  :  http://www.celestial-images.com


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