A 50mm guider with the 120mm guide scope will work just fine. I try not to over think things, some of the maths is too much for me to worry about. I had a 50mm generic Chinese guider and that worked a treat with my zwo120mc and 10" 1200mm fl newt. The thing I would be more worried about is "differential flexture", which is anything a minute fraction loose in your imaging train, ie loose camera mounts, focusers, t mounts or adapters.
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