K-3 II Astrotracer Weirdness

brenski · 2023-03-27T22:41:23+0100

really hoping someone can help with this: K-3II with Asahi Takumar SMC 200mm F/4 lens. so, calibration 'appeared to have gone well', but the resultant image [F/4, iso800, 20sec] appears to have 'doubled' every star in the image. strange though, because I next took a quick capture of the Moon [F/22, iso100, 0.7sec] appears nicely in focus. I used a Bahtinov to get focus for the first star image! and, a crop of the first image: