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Friday, June 12

M17 on a summer's eve

Fighting the mid-summer twilight and a waning moon, M17 emerged from the southern horizon last night through a short series of 4 x 5 minute exposures at ISO800.
A sequence of 10xflatfield, 10xbias and 5xdarkframes helped to minimise image noise, coupled with an Astronomik CLS deep-sky filter to lift the nebula from the light sky background.

Williams Optics ZS80ii, Canon 300D
EQ6 autoguided, 4 x 5 mins @ Iso800

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