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Lawrence Parchman

Sculptor Galaxy (NGC 253)

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Posts Made By: dan kowall

December 4, 2008 08:08 PM Forum: Equipment Talk

Lead Acid Batteries?

Posted By dan kowall
Here's Mark Keitel's interesting write-up on batteries:
http://aajonahfish.com/sinewave_power.htm

dan

December 19, 2008 03:27 PM Forum: CCD Imaging and Processing/Deep Sky

ST2000xm vs. ST10xme

Posted By dan kowall
Hi Joe,
You'll love the QE of the ST10. It's a noticeable difference.
Don't worry about the blooms, they're easy to take care of.
You didn't say what processing software you use, so I can't give a specific answer. CCDStack has an excellent bloom removal option or lots of people take a set of non-blooming short exosures and layer them in using PhotoShop or something similar. There are other techniques, too.
The ST10 matches up well with a long focal length 'scope. You usually don't have that many blooms to deal with.

dan

December 30, 2008 09:23 PM Forum: CCD Imaging and Processing/Deep Sky

Deer Lick & Stephen's Quentet

Posted By dan kowall
Excellent color, Sam, and a fine natural processing.
I was hoping that you would post a crummy image so that I could say "It's the Pitts!"

dan kowall

January 2, 2009 04:05 PM Forum: CCD Imaging and Processing/Deep Sky

IC 2169/IC 447

Posted By dan kowall
Jason Boyce said:
...... along with some other interesting reflection nebula....
......IC2167 which I think is just on the right edge of this image......
You're right, Jason, that is IC2167.
This area is dim and benefits from exposure time but your color looks good.
The widefield of this area:
http://apod.nasa.gov/apod/ap070412.html
offers targets that could keep one busy for weeks.
My regards,

dan

January 9, 2009 03:03 PM Forum: CCD Imaging and Processing/Deep Sky

NGC2170 region in Monoceros

Posted By dan kowall
That's a stunning panorama, Tom.
I think that you've done this region before at a longer f/l?
The wide field makes for a more compelling composition to these eyes.

dan

January 19, 2009 07:22 PM Forum: CCD Imaging and Processing/Deep Sky

M78/NGC2068-2067 area

Posted By dan kowall
Jason,
Could we take a look at your calibrated RGB master (without luminance) before you have started any gradient removal?
It's easier to diagnose a problem or correct a procedure when you can see the Before rather than the After.
I agree with the others. The color looks good, though the background is a little dark.

dan

January 19, 2009 07:25 PM Forum: CCD Imaging and Processing/Deep Sky

Rosette Nebula - HA and RGB

Posted By dan kowall
A most excellent image, Jim, superbly processed.

dan

January 26, 2009 05:04 PM Forum: CCD Imaging and Processing/Deep Sky

Looking For Some Help With An FSQ and AstroDon Fil

Posted By dan kowall
Brian Richardson said:
...My issue is that I am seeing star size very (sic) from my R to G&B......
Hi Brian,
Unless you're measuring a G2V star, I would expect variation. For instance, when imaging a red star through a blue filter, the star will be less saturated, dimmer, more point-like than in the red exposure.
In addition, I would think that being undersampled, as you are with the FSQ (2.88"/pixel), doesn't generate good star size data.
One other thought: Do you have the I series filters, the ones made for the interline CCDs like the ST-2000?


dan

January 29, 2009 03:59 PM Forum: Digital SLR AstroPhotography

From Orion to Horsehead

Posted By dan kowall
Wow!
Even the largest size looked good.
Except for one funky transition towards the left at the bottom, that's a well assembled mosaic.
My regards,

dan

February 3, 2009 07:48 PM Forum: CCD Imaging and Processing/Solar System

Comet Lulin - This Morning 2/3/09

Posted By dan kowall
Nicely done, Tyler.
The comet's already of a large size for your scope.
Those opposite tails make for a great composition.
Did you use the Closed Loop/Comet tracking on the Gemini or something else to guide on the head?

dan

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