20 Lights, darks stacked. The stars are slightly elongated, possibly due to tracking issue. I will be working on that. There is also an anomaly in the stars that produces a middle horizontal spike: I was using a Zhumell high performance urban sky filter ZHUL065-1 (no longer in production) and a field flattener from Explore Scientific. I will use the process of elimination to find the cause of the horizontal spike as well as re-checking collimation of the optical train. …and now to get better at processing in Gimp. 

By Steve J Posted in Main

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