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after MUCH reading on the topic I chose a side by side setup because it kept the center of gravity lower to the RA axis of the mount, and because it was quicker to swap primary scopes if the guide scope was mounted beside it rather than bolted to the top...
From what I've seen, balancing the system isn't all that hard, although you'll need to spend time to make sure its right.. For photography, the mounts balance is fairly crucial...
as Leon mentioned above, you dont have to guide on the exact object that you are imaging..
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