NGC6888, the Crescent Nebula in Cygnus, taken with an AP 140 F7.5 Starfire EDF Astrograph Refractor with 4" focuser.
The instrument was working at F5.7 with the 155TCC Telecompressor Corrector.
STL11000 camera - 4 hours Ha, 4 hours of O-3 and 2 hours of S-2.
This cropped image retains the full resolution of the STL11000.
Note the incredible detail throughout the image!
Image by Roland Christen.