Sharpless 157, the Lobster Claw Nebula, is a bright emission nebula in the constellation Cassiopeia at a distance of about 8,000 light-years. At the top-right is the open star cluster NGC 7510, about 9,900 light-years away.
Sh2-157
Telescope: 16″ f3.75 Dream Scope
Camera: FLI ML16803
Mount: ASA DDM85
Exposure: 5 hours (2x22x300s Ha & O3 + 3x6x300s RGB)
Date: July 2021
Location: Southern Alps, France
Hubble palette rendition (S2=R, Ha=G, O3=B), 7.5 hours
Bart Delsaert - Astrophotography 
Exquisite.