by Michael Lilly
M13 - Great Hercules Cluster
Taken in Michigan on 5/28/2006 but recently reprocessed to try to preserve star colors.
Combination of 42 subexposures (75s, ISO800). Taken with a Meade 10" LX200GPS, autoguided by DSI attached to Stellarvue SV80S. Imaging camera was Canon 20Da.
Calibrated with dark and flat frames. All calibration, stacking, combining and image processing done with ImagesPlus 3.5.