I accually took 400 subs of this one but stacking all 400 led to blown out stars in the core of the stacked image from DSS, not sure what happened but 300 subs looks ok, this image was also taken during a 45% illuminated moon and through the smoke from the neighbours fireplace.
47 Tucanae NGC 104
300 x 15sec subs at iso 1600 with 50 darks and 50 bias and no flats
12" LX200 (ALT/AZ setup NO guiding)
Sony Nex-3 DSLR
Processed in DSS, Startools and Gimp
Higher Res at
http://www.astrobin.com/52163/