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My experience has been the opposite of allan's. I use a tak fs60 with a QHY5 in solid rings as a guide scope but when I had a GSO RC8 I could not get round stars without an OAG. I initially borrowed an SX camera/wheel/oag combo to prove it was flex in the guiide scope and then bought an orion OAG. It was cheapish and the guide camera bit rotates around to aid you find a star. I had to modify it to remove slop but it worked fine.
I have lent that oag to a couple of very experienced people and both have tossed it out of the system as being too hard to setup and use. I'd recommend you try a guide scope first and hope it does what you want.
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