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Thanks Peter. The current Moonlight I am looking at also has temperature compensation. I looked at the Optec focuser, and it also look very nice, and as you said probably a bit more compact, in regards to the where the motor is fixed. And for pretty much the same price, I'm stuck between the two! I imagine they would be pretty similar performance wise. I think I'm leaning towards the moonlight at the moment.
Maybe a silly question, I understand how temperature changes affect focus, but how does the temperature compensation operate with these focusers? I am assuming there is a temperature probe, and the software knows the expansion/contraction properties of the Aluminium and adjusts the set focus by measuring the temperature differences, and calculating how much the focus may have changed by?
Erik
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