Doug S replied to the topic 'Can't get into focus anymore' in the forum. 4 years ago

Hi Jerry, On first glance, your HFR values are outrageously large. I think all the algorithms struggle with donuts (i.e. focus so far out that it's hard to tell what direction to go). I would recommend a manual search (first time is always the hardest) through the focus range, watching how HFR changes. When you finally find a good starting point, then run the algorithm (which ever you use, but I recommend linear) again. I wouldn't consider running the algorithm at all until you get inside of HFR=3 or better. You could have a HW problem, but the SW will not like those HFR values....

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