Globular cluster M13, Hercules
Another old favourite of the Spring sky. I've had to crop this far more than I'd like, though, as the photo edges looked awful due to coma and tilt (both of which bloat and mis-shape the stars).
22 x 1-minute exposures, ISO 3200, f/4. Modified EOS 600D & Revelation 12" Newtonian f/4 reflector telescope.
Frames registered and stacked in DeepSkyStacker software; curves adjusted in Canon Photo Professional; noise reduction in CyberLink PhotoDirector.
Globular cluster M13, Hercules
Another old favourite of the Spring sky. I've had to crop this far more than I'd like, though, as the photo edges looked awful due to coma and tilt (both of which bloat and mis-shape the stars).
22 x 1-minute exposures, ISO 3200, f/4. Modified EOS 600D & Revelation 12" Newtonian f/4 reflector telescope.
Frames registered and stacked in DeepSkyStacker software; curves adjusted in Canon Photo Professional; noise reduction in CyberLink PhotoDirector.