MESSIER 17
Optic: Canon 400 mm f:5.6 L.
Camera: Modified Baader Canon 350D (Halpha pass filter - see
here) at ISO800. Mount: Takashi EM200.
Processing: Iris
software. Exposure: 39 minutes (13 x
3 minutes). Location: Pic du Midi (altitude 2860 meters, french Pyrénées).
Date: July 29, 2006.
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