The Bubble Nebula, NGC 7635, in Cassiopeia
One from the clear, moonless nights a fortnight ago. I hadn't posted it previously due to the problem of focus varying across the frame. I think I know the cause(s).
Manually, off-axis guided for 9 x 5-minute exposures at ISO 1600, f/4. 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.
The Bubble Nebula, NGC 7635, in Cassiopeia
One from the clear, moonless nights a fortnight ago. I hadn't posted it previously due to the problem of focus varying across the frame. I think I know the cause(s).
Manually, off-axis guided for 9 x 5-minute exposures at ISO 1600, f/4. 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.