Sighting-in at the end of the white nights.
The goal was to test the OIII 4nm filter, which the Chinese sent as a replacement for a defective one. It works.
At a focal length of 2350mm, the Juwei 17 produces more than 50% rejects, but I managed to select frames with FWHM 2.5-3" totaling about an hour.
During processing, the visually apparent depth was pleasing.
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