Have you ever thought about the K-1 with Astro tracer?
https://nightscapephotographer.com/pentax-k1-astrotracer/
It uses the gps and IBIS to track star movement, up to 5 minutes, but I suspect
that is dependent on lens FL. It has other night features to help operate the
camera in the dark. You have to calibrate the gps.
K-1 is a DSLR hold out with OVF.
WayneS
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