Well after hours of searching I haven't been able to find any Canon shooters that have worked out the ratio (if there is one) between Sigma and Canon AF adjustment scales.
I spoke to Sigma support nice chap by the name of Daniel he explained the following with regard to the AF fine tuning with regard to the above set of figures I found, the x20, x40 x60 x80 etc figures are used by Sigma for testing and setup, however he explained that the distances used via the usb dock are indeed the ones to use for fine tuning the AF system.
Using the distances in the software will give a better AF performance across the entire focal range than using the x20, x40 method.
He also said to start at the 2.6m end of the scale and work up toward infinity at the various focal lengths, again stating that this will give a better result across the entire focal range.
So that is good enough for me straight from the horses mouth so to speak, that is what I will endeavour to do !!
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