This is an image of M1, the Crab Nebula taken with the historic Plaskett telescope at the Dominion Astrophysical Observatory in Victoria, BC.
Conditions - very clear periods between cloudy ones.
Dave Balam, telescope operator
Sensor: E2V operating at -110°C with a 2x2 bin yielding 2302x1009 pixels
Exposure - R filter 3x60s, V filter - 5x60s, B filter 7x60s.
Processing - Images Plus and Photoshop.