Saturday, 23 August 2008

A swan and a lagoon on a midsummer's night

Nebulae in Sagittarius, taken during the midsummer twilight period. They consist of many stacked exposures of about 30 seconds each at the ISO 800 Setting of my Canon EOS 350D, attached to the 'prime focus' position (using the telescope as a zoom-lens) of my 8 inch SCT at f/6.3. Unfortunately the Canon has a 80% blocking filter of the red light from nebulae and to remove it would be an expensive and difficult modification and would spoil the colour balance for all other photography. But I got these shots despite that! M17 the Swan nebula and M8 the Lagoon nebula.

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