Douglas Robertson/Horsehead Region in Ha

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Title: Horsehead Region in Ha   Location: Hahndorf, South Australia. Date: March 2011
Astro 40D (Avg temp -12.5ºC), Canon 400mm f5.6L lens @ f5.6
Astronomik 12nm Ha EOS Clip In filter
315 mins total exposure time (21x15min subs), iso1600