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One thing I don't quite follow on this thread. In my experience you notice weak guiding at any image scale. Sure 2x2 binning sometimes rounds out guiding errors to some degree but not fully.
Having more arc secs/ pixel will not hide guide errors. Of that I am quite certain. I have imaged at lots of different image scales. They all show guide errors.
In fact I find the CDK17 most forgiving of guiding and easiest to get round stars on and that has the lowest arc/sec/pixel of my setups.
So 1 arc sec/pixel it is for those with average seeing of around 3 arc secs.
Greg.
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