The Great Hercules Globular Cluster (M13) - 2022-05-18 02:22 UTC - Test Image

10 x 120s, Gain=100, L filter

Stacked in PixInsight

Levels stretch in Photoshop

 

ZWO ASI6200MM-Pro

TeleVue NP101is

Losmandy G11

 

With no more than ten frames and no noise reduction applied, I am surprised at how clean this image is. I plan to collect and add ten frames each in R, G and B.

 

I can see vignetting in the corners. I do have flat calibration frames to correct it. Vignetting will not be an issue in the cropped final image.

Done