Re: [APML] 10 frame Rosette Mosaic

["Bobby Middleton" <bobm@koyote.com>]

----- 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
> >
> >
> >
> >
> >
> >
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> Philip Perkins - philip@astrocruise.com
> Wiltshire UK & Luberon France
> Astrocruise - http://www.astrocruise.com
>
>
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