Re: [ccd-newastro] Re: M94
That is what I used.
Sent from my iPad
On Mar 31, 2012, at 10:05 PM, Michael Miller <circpro@...> wrote:
> Have you seen Adam Block's routine in CCD Stack on how to use dim data combined with bright data when you have a really bright core?
> Michael D Miller
> CEO VP Services
> On Mar 31, 2012, at 9:18 PM, "Bernard Miller" <bgmiller011@...> wrote:
> > Mike,
> > Another thing to keep in mind is the 8300 chip does not have a very deep
> > well. That is one of the drawback of that chip. It saturates very easily. I
> > can't even take an image of M45.
> > Bernard
> > From: firstname.lastname@example.org [mailto:email@example.com] On
> > Behalf Of Mike Dodd
> > Sent: Saturday, March 31, 2012 8:09 PM
> > To: firstname.lastname@example.org
> > Subject: [ccd-newastro] Re: M94
> > Bernard Miller wrote:
> > > Hi,
> > >
> > >
> > >
> > > Here is an image of M94. This one was a real challenge and a learning
> > > experience. The core was completely blown out with regular exposure
> > > lengths, so I had to merge in some 30 second exposures of the core.
> > > Even with that the RGB image was still quite saturated and hence
> > > while the core has some detail, it does not have much color. Comments
> > > and suggestions welcomed.
> > > http://www.azstarman.net/M94.htm
> > That's a nice image, but I'm puzzled why the core was saturated.
> > Are you sure? What ADU are displayed in MaxIm or CCDSoft as you mouse
> > over a FITS luminance subframe?
> > I haven't imaged M94 or used your camera, but I typically can go five
> > minutes on galaxies (even M33) with a similar OTA and ST-8 camera
> > without blowing-out the core. 30 seconds seems awfully short.
> > I'd be interested to learn what ADU values you're seeing in the FITS
> > subframes.
> > --
> > Mike
> > Mike Dodd
> > http://astronomy.mdodd.com
> > Louisa County, Virginia USA N37.58.23 W77.56.24
> > [Non-text portions of this message have been removed]
> [Non-text portions of this message have been removed]
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