Abell 2151 Galaxy Cluster in Hercules, with NGC 6045 (Arp 71) spiral galaxy type SBc, just left of center.
Taken June 9, 11 and 12, 2007 with a DSI Pro II and Outback Cooler on a C8NGT (8" Newtonian f5).
All subframes were 180 sec. The RGB subframes were also used to make synthetic L subframes (sL),
which were then used in the total stack of images to create the final L image resulting in the
following total exposures (L+sL):R:G:B (min) = (171+87):87:87:87. Color balance was achieved via
numerically scaled channels. Captured with Envisage, calibrated and sigma combined in Iris with
other processing using FITZ, PixInsight LE and Photoshop CS. North is up.