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Hi Doug
I think that setting the switch to operate within a limited range helps the AF work faster. That is, when you set it to 3m to infinity, it doesn’t try to go rack the AF all the way down to the minimum focus distance when attempting to AF the lens.
By restricting the range to cover only your specified region of interest, the AF should then home in on the correct focus plane quickly without having to exercise itself over the whole design range.
Cheers
Dennis
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