Canon Camera on star tracker at 300mm fl.
Stacked 8, 2m subs in deep sky stacker and processed in photoshop. Also cropped.
This is my second attempt at M13 in Hercules. I was hoping to improve on my last by bettering the focus and getting some more exposure time on it, but I forgot to put the dew heater on my lens. I though was happily surprised how it came out with minimal exposure time.