Autoguiding was not perfect, and stars got trailed a bit.
Equipment: Takahashi FSQ-130ED, IDAS NB12 HII OIII Dual Narrowband Filter or Clear Filter, and EOS R-SP4II, modified by Seo San on ZWO AM5n Equatorial Mount, autoguided with Fujinon 1:2.8/75mm C-Mount Lens, Pentax x2 Extender, ZWO ASI 174MM-mini, and PHD2 Guiding
Exposure: 5 x 240 seconds and 7 x 60 seconds at ISO 6,400 and f/5.0, focal length 650mm with NB12 Filter and 3 times x 720 seconds, 4 x 240 sec, 4 x 60 seconds at ISO 1,600 and f/5.0, focal length 650mm with Clear Filter
site: 1,232m above sea level at lat. 36 55 68 North and long. 139 44 57 East near Mt. Keicyo Tochigi 栃木県鶏頂高原. Ambient temperature was around -3 degrees Celsius or 27 degrees Fahrenheit. Wind was mild. Atmospheric turbulence was bad as in the season, and guide error RMS was 1.20".