Messier 33
Optic: Canon 400 mm f:5.6 L.
Camera: Modified Baader Canon 350D (Ha pass filter - see
here) at ISO800. Processing: Iris
software. Exposure: 50 minutes (10 x
5 minutes). Location: Pic du Midi (altitude 2860 meters, french Pyrénées).
Date: August 27.09, 2006.
The full frame
Crop at the original scale