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Re: [ccd-newastro] Re: M94

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  • Bernard Miller
    Michael, That is what I used. Bernard Sent from my iPad ... [Non-text portions of this message have been removed]
    Message 1 of 7 , Mar 31 10:40 PM
      Michael,

      That is what I used.

      Bernard

      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: ccd-newastro@yahoogroups.com [mailto:ccd-newastro@yahoogroups.com] On
      > > Behalf Of Mike Dodd
      > > Sent: Saturday, March 31, 2012 8:09 PM
      > > To: ccd-newastro@yahoogroups.com
      > > 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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