"First light" in my new observatory. The mount was poorly polar aligned - about 1 degree off. Inspired by Mark-Jaap ten Hove's idea 1)http://www.mark-jaap.nl/, deepsky section, image of M31 27-08-2014 using 30s subs of using very small sub-times, I decided to give the North America Nebula a try, before it will disappear from the winter skies. The result is striking. In the course of about 4 hours, the field drifted about 2 degrees, so only half of all images overlapped. The conditions were relatively good, with NELM 6.0 in zenith, but with fog drifting in later in the night. After I started the imaging sequence at about 22:00, I went to bed, and turned the rig off after waking up in the morning before heading off to work.
Combination of 484 images of 20s each, no images were rejected, because going over each would take too much time. I selected ISO6400 because that ISO gives the lowest read noise on the Canon 6D. Processing this collection took almost 24h on my workstation. Capture sequence of the Canon 6D done by gphoto2 on Debian.
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|1.||↑||http://www.mark-jaap.nl/, deepsky section, image of M31 27-08-2014 using 30s subs|