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I can't comment on the actual camera, but I used to use a ST-i colour for my oag before switching to a mono ASI174 - it worked ok, but of course the mono works a heap better.
I'd be willing to bet that even your colour ASI120 would do an ok job for the OAG in most situations.
As for the OAG improving things - it will depend. What problems are you having now?
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