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Showing results for tags 'ngc 7023'.
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Two nebulas from last night. After seeing the narrowband Pacmans just posted by toxic and others here, my RGB version looks a bit pale, to say the least, but I am just happy that the sky is dark again so I cannot stop myself from posting. I got my Sky Quality Meter out last night and it showed 21.2, so I cannot complain about light pollution. However, there were some haze that affected the resolution of my images and issues with the autoguiding. ES 127ED on an EQ8 in obsy with finderguider, Canon 60Da at ISO 1600. Pacman: 18 x 8 min. Iris: 11 x 8 min (then the haze killed the session)
Whilst California was being collected - https://stargazerslounge.com/topic/280659-355-hrs-in-california/ - we pointed Olly's TEC 140 in the vague direction of the Iris Nebula. Over the course of 3 nights, we got hold of 4.5 hours each of RGB for a total of 13.5 hours, plus 5 hours and 15 minutes of Lum. We extracted a synthetic luminance from the RGB and added this to the 'real' Lum (estimating that it gave us an equivalent of about 3 hours Lum). I was at the keyboard but Olly was hovering over my right shoulder prodding me in the right direction. We managed to get the praying ghosts in frame, which was a bonus.
The Iris Nebula captured from London on July 3rd 2015. This image is another test of guiding telescope capabilities, this time with a more challenging target and longer exposures. Over 8 minutes a small amount of movement was detectable but I'm hoping it may be possible to reduce that further.10 x 8 minute exposures at 400 ISO 3 x dark frames 5 x flat frames21 x bias/offset frames (applied to flat frames only)Processed in Nebulosity and Photoshop