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Rosette Nebula in Ha


Rosette Nebula in Ha

This image taken 7 March 2012 is the first image taken with my new William Optics Megrez 72 telescope and fitted with a William Optics 0.8x Reducer III(2011). It was taken as a test to see the wider field compared with the Megrez 90 and if the reducer was also effective as a field flattener. In both respects it seems to have done its job. It was intended to also take RGB images so that it was in colour but that is too late this time and will have to wait until next winter.
Exposure details: 18 x 10 minute guided exposures (= 3 hours total) through the refractor at prime focus with an Atik 314L+ CCD camera. Bias and flat field frames also taken.