Crab Nebula (Supernova remnant), 100% crop
Canon 350Da (baader IR-cut filter mod)
NPZ TAL-250K (Klevtsov's system) telescope (10", 1:8.5, 1:6 with special NPZ 0.7x reducer-flattener MkII).
EQ6 PRO Syn Scan mount, guided with 75mm refractor and QHY-6 ccd.
Sub-urban area, 10km off 300k city (visual ~6.0m sky)
7.3 hours by 10min subexpositions @ iso800.
Software: Iris, FIT's Stacker Photoshop.