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Ok just to wrap up this thread for anyone using an Atlas and focusmax in the future, this is what I have done with focus convergence settings.
I now have the steps at 100 and doing 10 samples and the scope focuses in 60 seconds. 105 seconds from start to finish and back onto the target.
I worked out the CFZ has 1870 steps in it and using 100 steps for focus convergence gives about 15 samples with the 10 being in the same step. I tried using 7 samples but found the focus not as totally accurate.
To work out your critical focus zone you times your focal ratio by the size of the pixels on your scope. That gave me 159 microns. There are 85nm to each step on the Atlas. I converted the 85nm to microns which is 0.085 microns and that makes 1870 steps.
I am still not 100% happy with the V curves and I am going to thoroughly check the collimation once I get hold of a glatter RC collimator. I suspect the V curves are being tainted by collimation issue. However at this stage things are working well.
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