Spring is typically the time of year for galaxy hunting. So why not try to capture as many galaxies as possible in one single frame? When you point your telescope in between the constellations of Hercules and Serpens you might come pretty close to achieving these expectations.
The Hercules Cluster of Galaxies contains about 200 member galaxies, some 500 million light-years distant, with a wide range of mostly spiral galaxies, a smaller number of elliptical galaxies, and a healthy collection of colliding galaxies. This image clearly shows the contrasting colors of younger star forming galaxies which are primarily blue, while older galaxies are mostly yellow.
Hercules Cluster or Abel 2151 – cropped image
Telescope: 16″ f3.75 Dream Scope
Camera: FLI ML16803
Mount: ASA DDM85
Exposure: 50x300s L + 30x300s each for RGB
Acquisition: March – April 2017 – Processing: April 2021
Location: Southern Alps, France
larger FOV
Bart Delsaert - Astrophotography 
Wow. This is absolutely stunning!