Re: [APML] Lumicon Deep Sky Filters

["John C. Mirtle" <spampit@shaw.ca>]

Jason,
    The Deep SkyŽ introduces a purple cast to the image which can often be
corrected in a scanned image. Some films with a strong green cast benefited
from this filter, such as Ektar 1000 and Ektachrome 400 when used in a cold
camera. Since you are not likely to use these films, you are probably better
of with a Hutech IDAS filter. It is almost neutral from what has been
mentioned on this list in the past.
http://www.sciencecenter.net/hutech/filters.htm
    I also sent an email inquiry to the "new" Lumicon with a question about
the compressor lens they sell for the Newtonian Easy Guider. I have also
failed to get a reply......

John Mirtle
Calgary, Ab. Canada

-30C and dropping.....!

----- Original Message ----- 
From: "Lane, Jason R" <jason.lane@navy.mil>
To: "Discussion of Film Astrophotography" <astro-photo@seds.org>
Sent: Monday, January 26, 2004 2:44 PM
Subject: [APML] Lumicon Deep Sky Filters



Hi folks,

Does anybody use one of these for astrophotography?  I'm curious as to what
effects (beyond the obvious blocking of light pollution) it might have
either good or bad....for example, color shift in stars or galaxies?  Also,
any filters out there that might be a better choice?  The caveat is that the
filter come in a T-mount threaded cell since I want to put it directly in
front of the camera body when at prime focus.  Finally, Lumicon's website
isn't very clear on whether or not they sell one in T-mount
threads...anybody have info on this?  I emailed Lumicon, but no response
yet.

Thanks!
Jason Lane

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