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Old 01-09-2015, 11:07 AM
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Shiraz (Ray)
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Join Date: Apr 2010
Location: ardrossan south australia
Posts: 4,787
all the above - it's image scale that matters, not focal length. From my limited experience an OAG will be easier to use than a guide scope at image scales below about 2arcsec/pix.

as a more general comment, an OAG can be difficult to fit into the back focus of a fast scope, so guide-scopes still have a place - not an issue for you though.
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