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Agree with comments that FL and pixel size not the issue. You have to have very rigid mounting of the scopes relative to each other. A tiny bit of flex in either means you'll loose some subs to egging or even streaking.
OAG more fiddley to set up but generally best outcome for round stars.
One nice advantage of a guidescope is being able to platesolve the finder to figure out generally where your main scope is. Also easier if you change around your main OTA lightpath/camera not having to reinvent OAG config and spacings.
Having used both I wouldn't go back from OAG now where its an option.
Last edited by RobF; 22-01-2016 at 04:36 PM.
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