Equipment:
— Samyang 135mm f/2 ED UMC Canon EF lens
— Optolong L-eNhance EOS-C filter
— Canon 550Da camera (26 frames per 120s, ISO 1600)
— Sky-Watcher AZ-GTi mount (EQ mode).
Calibration and stacking with DeepSkyStacker.
Double Cluster in Perseus, Soul and Heart nebulae