Re: [APML] New image: The Crescent Nebula

[Juan Conejero <skycad@ctv.es>]

Hi Scott,

Thanks. Manual guiding can be hard or easy, depending on the instrumental 
and environmental conditions. With our scope and off-axis guider, and 
working in the comfort of our backyard (which is more and more important as 
one ages), guiding exposures not longer than about 60 minutes is a nuisance 
as far as one has a reasonably bright star at hand. I love to stay in the 
quietness of night, but sometimes I spend the exposure time hearing good 
music. However, all that changes rapidly as one surpases the 60-min 
frontier. 75 minutes is somewhat tedious, 90 is very difficult, and 120 
minutes becomes almost an impossible task, at least for me.

Yes, the IDAS LPS is doing a great job. We love it.
We stacked the images with our software. We calculated the average of the 
four images, resulting in a signal-to-noise ratio improvement factor of 
roughly 2.0.

Regards,
______________________________________
Juan Conejero, Pleiades Astrophoto
skycad@ctv.es
http://www.pleiades-astrophoto.com/en.html

At 21:34 05/06/2003 -0400, you wrote:
>Very nicely done. That's quite impressive, 4 hours of manual guiding!!! The
>IDAS filter does do a great job.
>Did you use this new software for stacking the images, or did you use
>something else for this?
>
>Scott Hammonds
>
>----- Original Message -----
>From: "Juan Conejero" <skycad@ctv.es>
>To: "Discussion of Film Astrophotography" <astro-photo@seds.org>
>Sent: Thursday, June 05, 2003 9:05 PM
>Subject: [APML] New image: The Crescent Nebula
>
>
> > Hi all,
> >
> > Our last production is an integration of four 1-hour shots. It's NGC 6888
> > on E200 through our LX200 12" + IDAS LPS. As usual, you can see it at two
> > resolutions:
> >
> > 800x800:
> > http://www.pleiades-astrophoto.com/gallery/LX20012.n6888.en.html
> >
> > 1024x1024:
> > http://www.pleiades-astrophoto.com/gallery/LX20012.n6888.1024.en.html
> >
> > This image is the "first-light" of our new image processing software
> > project, in which we have been working hard during some months (and many,
> > many more that are to come). So far we call this monster PixInsight, but
> > this name may well be changed. The news with this image are mainly related
> > to noise reduction, which has been done entirely through wavelets
>processing.
> >
> > We continue very happy with our IDAS LPS. Besides wonderful light
>pollution
> > suppression, an additional effect of this filter is due to its cutoff at
> > about 420 nm. It acts like a minus violet filter, which is fine since it
> > renders Halpha truly red, unpolluted by UV.
> >
> > Comments welcome,
> > ______________________________________
> > Juan Conejero, Pleiades Astrophoto
> > skycad@ctv.es
> > http://www.pleiades-astrophoto.com/en.html


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