Trifid Nebula, M20, in Sagittarius

19 x 1-minute unguided exposures at f/4 and ISO 3200.

Using more exposures helps reduce digital noise, so I also included 3 x 3-minute manually off-axis guided exposures at ISO 1600, f/4, taken in 2015.

Modified EOS 600D & Revelation 12" Newtonian reflector telescope.

Registered and stacked using DeepSkyStacker; curves adjusted in Canon Photo Professional; noise reduction via CyberLink PhotoDirector.

Done