15255Re: First calibrated image
- May 1, 2003Randy, Paul, Don, and Ron,
Thanks, I feel very encouraged by your warm responses.
The lightbox seems to be working out quite well. When I first got
the white acrylic sheets I thought there was no way those 4 little
LEDs could shed enough light, but it really works. Thanks again to
Don for sharing his plans.
Polar alignment indeed was very good this night, but I have to give
some credit to the new worm of the G11 as well. I haven't done the
math on this setup but I think it's in the neighborhood of 3-4
arcsecs per pixel. I haven't measured PE on this mount but I'm
guessing it must be in that neighborhood, no?
Indeed the flats look good. With the f/3.3 FR on the C8 I get a very
noticeable hot spot, which up till now I've been trying to remove
(unsuccessfully) in Photoshop. With the flats it's completely
removed. I love it!
Let me end with one question. Since this is a brand new camera I
haven't had the opportunity to get it dirty <g> and I see no dust
motes or donuts on the flats. I have some images from a couple weeks
ago taken with the exact same setup which have not been flat
fielded. Any harm in applying these flats to those images?
--- In firstname.lastname@example.org, "Wodaski Yahoo account"
> First, that's a really nice M101. Details are sharp, stars arereally
> round - a neat effort. The flat fielding must be good, too, becauseI see no
> evidence of any flaws.http://docs.yahoo.com/info/terms/
> Ron Wodaski
> author of The New CCD Astronomy
> -----Original Message-----
> From: Frank Barrett [mailto:frankb02@b...]
> Sent: Wednesday, April 30, 2003 4:08 PM
> To: email@example.com
> Subject: [ccd-newastro] First calibrated image
> Here's my first attempt at a fully calibrated image with my new
> light box. In keeping with the recent theme it is, of course, of
> M101 ;)
> I'm just a bit concerned over the noise in this image. I would have
> thought that an hour long exposure would not have resulted in so
> much noise in the faint arms. Am I overstretching this with curves?
> Thanks, Frank
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