In the past, many people went for the Olympus OM-1n or OM-2n for astro use. The 1 is a mechanical/manual camera which doesn't need batteries and has mirror lock-up. The 2 is an electromechanical with auto-exposure but without mirror-lockup. Both have very well damped mirrors, so even with the 2, vibration from the mirror isn't a problem.
Both are semi-pro/pro grade cameras. Other suitable Olympii film cameras are the OM-2s (spot metering), the OM-3Ti (titanium body, manual only) and the OM-4Ti (titanium body, electronic, spot metering).
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