Provided you have a fairly sensitive guide camera like the Orion star shoot autoguider or the QHY5 you'll be fine! With my QHY5 i've used a 50mm finder scope as a guider and had great results...
I used the ZS66 to guide my C11 and had very few guide issues, and most of them I would attribute to having nearly 22kgs on an EQ6, not due to the ZS66 not being capable...
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