Well thank you Bob. That information is very helpful. I have the xm version of the onag and I have only had to use the x-y platform once to find a star. I'm using an Ultrastar for guiding camera on a 2148mm f/l AGO IDK scope. Problem that I currently having are the random crashes of maxim and not being able to utilize ccdap with PHD2. Hence, the need to move on to SGP.I am glad to see that the focusing routine has been improved, so thanks for your insights............Jerald