Re: [APML] New M42 Image

[Grant <GB1029@inter-linc.net>]

Mike,
Thanks for looking.  rings are definitely not an isolated incident then.
Next run I'll try some shots with and without the compressor.  And some without
the lps filter.

 > He suggested a number of tests that could be performed.
Like what?  Anything worth mentioning?

Grant

At 06:42 PM 1/18/02 -0800, you wrote:
>I have had these artifacts in my shots as well.  I use an AP refractor, with
>the telecompressor, but not the IDAS (have one, just never used it.)  These
>halos, sometimes rings, show up in my shots around the brighter stars,
>Mag 4 or better.   Spoke to Roland Christen sometime early last year.  He
>suggested a number of tests that could be performed.  Since then, my skies
>have been rarely suitable to imaging, so I want to shoot first, test later.
>The last 2 shots I have been able to take were in August '01 of IC1318.  In
>both,
>Gamma Cygni has a very annoying HUGE halo.  Haven't  yet had the patience to
>devote time to trying imaging with and without the telecompressor to see if
>it might be part of the problem.  I say this because there was an old
>posting in the archives from Jim Janusz referencing this halo effect which
>he tracked down to his AP field flattener.  Said component was reworked by
>A.P. and his problems were diminished.
>
>Maybe Roland Christen could add something to this ?


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