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Telescope: 11" Celestron NexStar with f 6,3 foc.red. Camera:SBIG ST-2000XM. Guiding: SBIG AO-7 working at 5 herz. Filters: Standard RGB SBIG filters.
This is a dark cloud near to the great nebula of Orion M42-M43. It is not hard imagine why it`s called a Horsehead nebula. Total exposure time was 3 hours. This is a RRGB image where the lumenence channel was exposed thru RED filter.