Re: [APML] 10 frame Rosette Mosaic

[Colt Bednorz <colt@airmail.net>]

Bobby,
Very nice as usual. I  found the resolution comparison
very interesting. Thanks for showing this.

Colt Bednorz

Bobby Middleton wrote:

> ----- Original Message -----
> From: "Philip Perkins" <philip@astrocruise.com>
> > I was impressed by the rather good colour of the
> > Ha regions in your shot
>
> Hi Philip and thanks. The good color is consistant for me with LE400; that's
> why I've been using it and it's alias PJ400 for the last 3 years.
>
> >I suppose the big mosaic is because you can't get your
> > hands on a decent 120 format film?
>
> Yes, and the fact that the 12.5" newt at 2200mm will outdo the BRC
> resolution-wise. But the color I can get with the LE400 is a big reason I do
> the 35mm mosaics. And I also just enjoy an intricate project like this. I
> used to build all kinds of models when I was a kid so I just like putting
> stuff together <g>
>
> > The interesting thing is that you can
> > cover the entire Rosette region on 120 format with your 12.5" by using the
> > AP focal reducer.
>
> I'm afraid the stars would get pretty nasty out past a 35mm frame with my
> newt unless the AP reducer would correct for that.
>
> > I have to say that the 120 format situation is
> > pretty dire at the moment...
>
> Agreed. That's why I offered $300 up front if Kodak would come up with some
> 120 LE400. But you and I know $300 ain't going to move that horse <g>. I'd
> offer more than that if it would make something happen.
> Bobby
>
> "For we did not follow cleverly devised tales when
> we made known to you the power and coming  of
> our Lord Jesus Christ, but we were  eyewitnesses
> of His majesty."                                  II Peter 1:16
>
> > --Philip
> > At 13:15 10/02/02 -0600, you wrote:
> > >Hello all. I've finally posted my "winter project" for this season. It's
> a
> > >10 frame (yep; ten) mosaic of the Rosette nebula. I was able to oevrcome
> the
> > >frame warping difficulties that kept me from going past 5 or 6 frames on
> my
> > >previous projects by registering the central 3-4 frames with Registar on
> top
> > >of a wide-field image; then building the additional single frames on top
> of
> > >that. I still had some warping but I believe one can take the image at
> > >whatever stage and re-register it on a widefield image to get things back
> to
> > >linear alignment. It's here:
> > >http://www.koyote.com/users/bobm/rosette2.htm
> > >All 10 frames are composites of two 60 min exposures on hypered Kodak LE
> 400
> > >film.
> > >I posted a high-res crop of this to the AP users group about 2 weeks ago
> for
> > >comparison with CCD images made with two different wide-field
> instruments.
> > >The high-res central crop from my 12.5" f/7 newt is on the page below
> along
> > >with an identical crop from Ray Gralak's AP 105 st-8 Ha image and Mark
> > >Jenkin's Ha image from a 9.25" Mak-newt with a FLI CCD camera. Those
> > >comparisons are at the link below if anyone is interested in resolution
> > >comparisons of film and CCD cameras. The fewer stars from the CCD images
> are
> > >a result of the Ha filter.
> > >http://www.bigcigarastronomy.com/Rosette-Comparison2.jpg
> > >Bobby Middleton
> > >
> > >
> > >
> > >
> > >
> > >
> > >--  APML Archives at <http://astro.umsystem.edu/apml/>  ---
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> >
> > Philip Perkins - philip@astrocruise.com
> > Wiltshire UK & Luberon France
> > Astrocruise - http://www.astrocruise.com
> >
> >
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> >
>
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