Swan song - late M13

Here's a pretty late for the season M13, shot last September 27th.

Takahashi FS102 @ f/8
Takahashi EM200 mount
SBIG ST-8XE
CFW-8a filter wheel with Astrodon LRGB filters
IDAS LPS Filter
Lumicon Minus-V filter
L: 8 x 5 minutes binned 1x1
R: 4 x 5 minutes binned 1x1
G: 4 x 5 minutes binned 1x1
B: 5 x 5 minutes binned 1x1

CCDSoft used for capture, MaximDL for calibration, registration and stacking. Photoshop CS for final processing.

A scaled-down full-sized image is attached. A full-sized crop can be seen at http://members.nuvox.net/~on.aunt/DSO/M13Crop.jpg

I can't seem to quite get the yellow stars out.

Comments and suggestions welcome.
Eric

Attached Image:

Great shot Enrico!
Is that Mickey Mouse I see at the bottom, towards the right?

Hi Eric,
It looks pretty good so far. Most imagers skip the luminance when shooting globulars, and just do RGB 1x1. You might want to try that with your data.

dan kowall

hi Eric,

i read your post on on yahoo groups about the blue halos.
One trick i sometmes use is to median filter the rgb componets before combining them. Look at the realtive star sizes in the r,g& b images and they may be unequal, in your case the blue maye have a larger FWHM of the stars. This could be do to focusing, optics, tracking or atomspheric refraction.

Median filter the offending image(s) until the star sizes are equal ie in Maxim the r may require none, the green a 3x3 matric and the blue a 5x5 matrix. You wont lose any resolution when you do the rgb in Maxim.

clear skies,

Larry

Nice one Eric!