Simeis 57 The Propeller image

Simeis 57 The Propeller


Acquisition Details
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Description

The interestingly shaped nebula in Cygnus, taken with a TMB8 f/9, STL6303 camera, Barr Associates 4nm H alpha filter, 10 hours exposure (30 minute subframes). Processing in Maxim with DDP stretch and unsharp mask.