23 hours of exposure time, taken during a full moon over a couple of sessions from December 31 to January 3rd. The lobster claw or SH2-157 is one of my favourite objects to image now. Imaged using my Skwaytcher 200P, 533MMPro and 3nm Sii, Ha and Oiii filters. I love the central star area SH2-157a which sculpted by the centre.