Xmas Eve, 2020: Horse-Head Nebula with Optolong L-eXtreme filter

[michael.h.f.wilkinson]

Managed to get 2 hours 3.5 minutes of data on the Horse-Head last night with APM 80mm F/6 triplet, 0.8x reducer, Optolong L-eXtreme filter, and Canon EOS 550D (modded). Despite making new darks, and (manually) dithering I got some pattern noise in the inky black background.

Combining it with data from December 18 which showed much more pattern noise, for a total of 4 h 25 minutes of data, improved matters

Still have to combine this with 2 hours of data without Optolong L-eXtreme filter

[michael.h.f.wilkinson]

Just added the older data in a quick and dirty way (hadn't computed a weightmap for these data yet, so edges show up more than they should) so needed to crop out tthe edges a bit more.

Pattern noise still showing. Perhaps I should gun for this with the ASI183MC instead (perhaps even with the 0.6x reducer)