Pal13 is one of the smallest and faintest globular clusters known. Visual mag of 13.8 and an angular size of 1.2 arc-minutes. Individual stars 17.5 and fainter.

7 hours and 20 minutes total exposure with the Mak-Newtonian and Canon T1i.
Image taken over 2 nights 9/13 and 9/14 2012, Hillsborough NJ.

Orion 190mm Mak-Newtonian F/5.3
Modified Canon T1i, no filters
Celestron CGE GEM
OAG-9 and Lodestar guide camera
176*150 second 800iso sub exposures
30dark/30flat/30bias calibration frames
Ambient temp 62.5/59.0 58.5/54.5