15 lights, darks, flats with bias removed
Using alt-az so exposures 15 secs
Nebulosity, Fits liberator, PS-C6
Saxon ed 120 prime focus, Canon 500d
George
For 15 x 15 sec no guinding with Canon the image is very well. It is the third most bright globular. If globular is very difficult to capture with details, resolution and colors... when it is very bright this difficulty is bigger.
The stars around, despite of its magnitude, are better than the stars inside the nucleous. That is normal, because of the brightness of its nucleous.
It seems that despite of the short time you had much noise. The background has some fake clouds, and the faint stars close the core are together, like lines. What ISO that you used ?
