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you will find that because the off axis guider is picking off stars at the edge of field , all your abberations come into play.... unless you have a flat field scope......... which the ed80 is not.
the previous general historical concensus was to go with a separate guidescope really solidly attatched
piggybacking is a good place to start and you can just guide straight through the scope and get used to the guiding, also with the reduced focal length you will get pleasing results straight away.
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