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Focus requirements of my various scopes do vary.
My refractors need to be refocused once they cooldown but tend to stay in focus once cooled down.
My AP Honders is the same but does not shift focus much after the initial cooldown. I use temperature compensation to match the focus shift and it helps but is not as precise as it could be.
My CDK is carbon fibre and is very stable focuswise once the primary mirror matches the ambient by around .5C. So much so that the next night focus often is the same.
So for me its more of a getting a bit more precision now there are several autofocusing softwares now.
Greg.
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