Whirlpool Galaxy, M51 in Canes Venatici

10 x 4-minute exposures (taken 26 March 2017) and 10 x 5-minute exposures (taken 21 February 2014) at ISO 1600, f/4. Manually guided off-axis. Modified EOS 600D & Revelation 12" Newtonian reflector telescope.

Registered and stacked using DeepSkyStacker; initial curves adjusted in Canon Photo Professional; final curves & colour-balance adjusted using Paint Shop Pro; noise reduction via CyberLink PhotoDirector.

Done