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It is fractionally out of focus, can tell by the hard edges on the stars. No star has a hard edge. I've been there a number of times, it's hard to tell from the rear screen of a DSLR. That's the only reason I bought a Canon or two, for the BYEOS focusing tool and software control capability.
And yes, big bright stars are NOT your friend for guiding. A smaller slightly isolated star will give a nice parabola shape that the software can interpret the brightest point and centre the guiding much better. You can change the period or the gain to improve the process as well. I'm running about 2 secs with about 50% gain and hardly have to move the guide scope to find something suitable, except round Octans of course !!
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