Crescent nebula. NGC 6888
2.5 Hours exposure (16x30 minutes) with an 18 inch F/4.5 newtonian running at F/8 (AP barlow lens)
ST-8XE camera at -30C
Guiding with AO-7 at 11 Hz
FWHM between 1.4" and 1.6"
6 nm FWHM H-Alpha filter
