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Craig Stark (phd guiding) suggests that his software is capable of at least 1/5 pixel resolution and much finer for high SNR. On that basis, if the angular pixel scale of the guider is less than about 2.5x that of the imager, you should be OK.
regards Ray[/QUOTE]
That seems like a good rule of thumb.
At the end of the day though guide scopes are a thing of the past and give variable results due to flexure.
I'd treat them more as a last resort if you can't fit an off axis guider. OAG's performance leaves the best guide scope for dead.
Greg.
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