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If you are thinking of going on to an OAG at some point you might want to find out more about that when you buy a guiding camera. Different format cameras have different backfocus and connections which need to pair with the OAG you choose so you can achieve focus without also buying another bunch of adapters or a different guide camera. If you are sticking with a guide scope and shorter focal lengths it will not matter.
I have found that guiding with my larger chip camera on an OAG is easier as more stars are available on auto but harder to see the stars and focus. The OAG is not as good on a newt as on a refractor or SCT due to coma and short back focus but it does work .
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