Astromart

February 20, 2006 10:11 PM Forum: CCD Imaging and Processing/Deep Sky

Seagull Nebula - HA-RGB

That's another fine effort from you, Jim.
The colors look right on, the mosaic is seamless, and it's nicely framed.
My only suggestion would be to reduce the sharpening and/or noise reduction a bit. There's a bit of mottling in the background from this procedure.
My regards,

dan kowall

February 25, 2006 09:19 PM Forum: CCD Imaging and Processing/Deep Sky

Bode's Galaxy M81

Posted By dan kowall

That's exceptionally well done, Johannes. The large image is a treat to look at.
One rarely sees such good color and resolution on Holmberg IX, too.
It does seem as if the weather has been notably poor for most imagers this winter.
My regards,

dan kowall
photonhunter.com

February 26, 2006 02:43 PM Forum: CCD Imaging and Processing/Deep Sky

NGC 2903

Posted By dan kowall

That looks good, Jim.

dan kowall

March 3, 2006 06:09 PM Forum: CCD Imaging and Processing/Solar System

a bit of saturn weather

Posted By dan kowall

Good weather for Alan Friedman + Bad weather on Saturn = One great image.
Well presented, too.

dan kowall
photonhunter.com

March 4, 2006 05:01 PM Forum: CCD Imaging and Processing/Deep Sky

M-101 - Definitely a Work in Process

Posted By dan kowall

I read in your other post that this is a first light with an FRC. That is supposed to be quite a scope. You must be pretty excited to have that waiting for you in your observatory.
It looks like you've handled your light pollution problems well, Mike.
I noticed some misregistration in this image. I think if you redo the registration, you'll find an even better image awaits you.
Other than that, you've got a fine M 101 'in the works'.

dan kowall
photonhunter.com

March 5, 2006 10:24 PM Forum: CCD Imaging and Processing/Deep Sky

Attempting longer subs.

Posted By dan kowall

Hi, James.
To get the most out of your system you need to adjust your exposure times to get your background ADU to a certain level.
To make it easy, just go here:
http://www.ccdware.com/resources/subexposure.cfm
have a 3 minute exposure with a dark applied, and the program will give you the optimum exposure length for your system.

dan kowall
photonhunter.com

March 5, 2006 10:34 PM Forum: CCD Imaging and Processing/Deep Sky

Long vs. Short Subs

Posted By dan kowall

I just answered this question in response to another post, but I'm not above repeating myself.
You want your subs to be as long as possible without saturating your object. In practical circumstances, though, sky glow from light pollution is going to be a limiting factor.
The hard work in figuring out exposure times has already been done by others:
http://www.ccdware.com/resources/subexposure.cfm
The instructions will have you take a 3 minute test exposure with a dark applied. Once you've plugged in the numbers for your system, an optimum exposure is calculated.

dan kowall
photonhunter.com

March 10, 2006 10:05 PM Forum: CCD Imaging and Processing/Deep Sky