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Douglas Rollain

Lion Nebula SH2-132 - RC71

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Posts Made By: Jim Thommes

May 23, 2009 03:29 AM Forum: CCD Imaging and Processing/Deep Sky

Beehive - wide field

Posted By Jim Thommes
Tyler, Charlie,
Thanks for the comments. I did hit the saturation levels a bit but I was kind of afraid of overdoing things. I have found that things can go south pretty quick hitting the saturation too hard.I might give it a try for a bit more.

May 29, 2009 06:18 PM Forum: CCD Imaging and Processing/Deep Sky

3 nights work

Posted By Jim Thommes
Nicely done Steve.

Did your modification to the D50 include the space reduction feature? grin


May 29, 2009 06:32 PM Forum: CCD Imaging and Processing/Deep Sky

Another two images from this weekend

Posted By Jim Thommes
Floyd,
That's a nice pair of globulars.

May 31, 2009 05:05 PM Forum: CCD Imaging and Processing/Deep Sky

A shocker in Serpens! Sh2-64

Posted By Jim Thommes
Pretty impressive Tom. As you say - a shocker I would not havce guessed. You do set the standard for dirt and dust.

June 2, 2009 06:03 PM Forum: CCD Imaging and Processing/Deep Sky

LEO Triplet

Posted By Jim Thommes
Sam,
I'm glad you were able to get out. Your image is a real delight to look over. Well done.

June 2, 2009 06:17 PM Forum: CCD Imaging and Processing/Deep Sky

M5 with Takahashi refractor

Posted By Jim Thommes
Cool image Franck. This is a nice image of the M5 globular cluster.

Seems the color is a bit biased toward blue. It might be that improved core resolution and color could be had with globulars with 16 subs at 2 minutes. What was the focal length set up on your Tak?

June 3, 2009 09:49 PM Forum: CCD Imaging and Processing/Deep Sky

Sunflower Galaxy

Posted By Jim Thommes
Thanks for the comments folks.

Floyd, I assume by double everything, you mean double the number of subs and subframe exposure time for LRGB? I tend to agree that more exposure data could be useful. Given the arc sec per pixel scale, I may be tempted to get the increase data through in-camera binning.

June 6, 2009 04:30 PM Forum: CCD Imaging and Processing/Deep Sky

Trifid Nebula TEC 180FL

Posted By Jim Thommes
Greg,
Cool image - very impressive.

I am watching with close interest results from the KAF8300. I am considering a camera with either the KAF-8300 or the KAI-4022. I like the lack of a shutter on the KAI - since it allows for a filter wheel with Canon lenses. With the KAF and mechanical shutter there is too much back focus to put a filter wheel in the image train.

Your result with the KAF is sure a lot of positive reinforcement for a choice that gives up a filter wheel on these lenses.

June 6, 2009 04:33 PM Forum: CCD Imaging and Processing/Deep Sky

M27

Posted By Jim Thommes
Hi David,
The M27 and the cluster are a nice pair of images from the Atik.

June 6, 2009 04:51 PM Forum: CCD Imaging and Processing/Deep Sky

Sunflower Galaxy

Posted By Jim Thommes
Greg, Jared, Sam,
Thanks for the comments.

Jared Willson said:

By my calculations, you are at just about 1 arc second per pixel if binned 1x1. What sort of FWHM values were you getting in your raw data before any non-linear stretches were applied? If your seeing is average, you may well be able to bin 2x2 with no significant loss in resolution.
So it looks like my FWHM is about 4. At 1x1 it is a tad under 1 Asec/pixel. Some of the FWHM is due to seeing. But it is the FWHM that leads me to think I can bin 2x2 and not loose much if anything in resolution but gain significantly in S/N

Sam Pitts said:

Nice shot Jim, are you using the AP .67 reducer with your SCT?

Sam
I am only using the Celestron 0.63x reducer/corrector. It is my understanding that the AP has no correction feature and that it is best applied on optics that are already reasonably flat and color corrected?

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