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I think the "general rule" is that if your guide errors are below your resolution you're ok, so as your focal length gets bigger you have less margin for error, which is why I sold my NEQ6 recently and bought an EQ8.
With the RC8 I'm capturing 0.74"/px (not the 0.82 I thought, because it turns out the older RC8s don't seem to be the same focal length as the new ones!) and I was never able to get the RMS error consistently below 1.2" This led to a lot of frustration, blurry subs, and wasted time.
If I'd just been using my ED80 with the Atik 314L+ where I'm significantly undersampled at 2.2"/px that 1.2" would have been totally fine.
The interesting thing is based on Craig's article I'm not sure there's any point in imaging at the full focal length of the RC8 where I am, as I don't believe I have better than average seeing. If the theory is correct, I'd probably be much better off getting a 0.8x reducer.
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