Re: [APML] Beta Scorpi nebulosity

[Aplanatic@aol.com]

Loke,

>From my experience PPF has much more grain than hypered TP.  I used the TP shot as the luminance channel of the final image and therefore got the benefit of its fine grain and high resolution.

If I image this object again, I'll take at least three 90-minute exposures on TP, stack them and then combine with the original PPF image.  That's the way to get more detail and dynamic range from this object, IMHO.

Yes, it would be nice to reduce the sky background using a filter.  One could use a blue filter on the TP exposures and then replace the blue channel of the PPF exposure with the filtered TP exposures, creating a high contrast, high dynamic range color image.

Dave

> Dave,
> 
> Wow nice shot. You have quite a bit of image scale and detail here. PPF
> looks so much like tricolor Tech Pan sometimes. I wonder what it would take
> to get better results with this nebula. The blue is very wideband right? so
> can't use a narrowband filter for SNR enhancement.
> 
> Loke
> 
> 
> 
> > -----Original Message-----
> > From: astro-photo-bounces@seds.org
> > [mailto:astro-photo-bounces@seds.org]On Behalf Of Aplanatic@aol.com
> > Sent: Thursday, June 19, 2003 1:22 PM
> > To: Discussion of Film Astrophotography
> > Subject: Re: [APML] Beta Scorpi nebulosity
> >
> >
> > Chris,
> >
> > Nice image!  This object is indeed very faint and it's tough to
> > get much dynamic range in the nebula.  You and your Schmidt did a
> > fine job.
> >
> > As a comparison here's my attempt with the Slevogt camera (9"
> > f/4.5, medium format).  It's a two-stack of PPF (90 minutes, as I
> > recall) and TP (60 minutes):
> >
> > http://members.aol.com/darowe0000/IC4592_more_color.JPG
> >
> > Dave Rowe
> >
> > > -----Original Message-----
> > > From: cschur@cybertrails.com <cschur@cybertrails.com>
> > > To: astro-photo@seds.org <astro-photo@seds.org>
> > > Date: Thursday, June 19, 2003 2:48 PM
> > > Subject: Re: [APML] Beta Scorpi nebulosity
> > >
> > >
> > > >Chris an amusing comment, I was at sky fog limit at 8 mins.  Perhaps
> > > >stacking 4 or 8 images would be deeper.  Sounds like a job for
> > Registar.
> > > >
> > > >Chris  Schur
> > > >
> > > >> Nice framing and good shot.  This is definitely an object
> > that requires
> > > >> a dark sky.
> > > >> I do think the Schmidt and Supra 400 is capable of 
> going deeper,
> > > >> especially from your site.
> > > >>
> > > >>
> > > >> Chris
> >

_______________________________________________
Astro-Photo mailing list
Astro-Photo@seds.org
http://seds.org/mailman/listinfo/astro-photo