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Hi Don,
IMHO, OAG for an ED80 is a bit of overkill. I have (and recommend) a simple 50mm finder guider. I basically set up the scope, polar align. Then use the 50mm finder guider and PHD to guide.
I am currently experimenting with an OAG set up with my C8 and f6.3 reducer, has been frustrated by weather in Melbourne, so cannot comment on the OAG path. But for a short FL of an ED80, a simple finder guider would be sufficient.
Bo
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