M6 butterfly cluster_sag5_090623-11_80x0p80s_dk_hg2bc2_hpm1_lvl1

Messier 6 Butterfly Cluster - an open cluster of stars just north of the scorpion's tail.

 

80 x 0.8 second exposures

 

Camera was a 1004x-JG modified video camera on a fixed tripod and ball head. 135mm F2.8 M42 screw thread lens stopped to F4. No filters. Camera in gamma mode 1 (highest internal DSP gamma stretching) and gain 75%.

 

Stacked and gamma stretched in Registax 5, high pass masking in

Photoshop Elements.

Done