Thanks Nigel and Peter, max travel is probably the culprit as you say, but based on experience of other autofocus programmes, I was expecting EKOS to determine a limit of increasing size itself to decide whether to focus in or out, to auto v-curve the action.

Is there a description of the algorithms employed in the various measurement options so I can see how the main variables the user inputs will affect the operation of the system?

All the best

Mark

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