From: Johannes Schedler (schedler_at_antispamdomain.not)
Date: Tue Jun 24 2003 - 01:38:03 EDT
Thanks, Guy's!
Robert, I used only the 2" UHC filter that threads into the 2" focal
reducer nose, so it is quite close to the focal plane and does not
cause much distortion.
Johannes
--- In digital_astro_.at._yahoogroups.com, "r_malin2" <robt.wndy_.at._v...>
wrote:
> Excellent Image Johannes........
> I'm a little confused about your filter or filters...
> Did you use just the UHC, or also an H-alpha???
> Also, what did you use as a "filter Holder" ???
> Robert
>
>
> --- In digital_astro_.at._yahoogroups.com, "Johannes Schedler"
> <schedler_.at._c...> wrote:
> > Yesterday I was short of sleep and took a lot of images from
> NGC7000
> > in this warm midsummer night.
> >
> > The first results with 5 min at ISO800 and mag 5 sky in white
light
> > were disappointing, as almost no nebula showed up and the
> background
> > was grey.
> >
> > So I tried the Lumicon 2" UHC filter with >95 transmission in H-
> beta,
> > O3 and H-alpha. 10 min shots at ISO1600 resulted in a blue nebula
> > with some red lines, but it was there!
> > See the details and result after a lot of processing, color
> shifting
> > and blurring with masks to reduce the noise:
> >
> > http://panther-observatory.com/deepsky.htm#78
> >
> > Later this week I will include the filtered raws to my 10D review.
> >
> > Hope to get some more efforts for comparison on this object from
> you
> > (Rick, Mike, Mark?)
> >
> > Johannes
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