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Message: <blockquote data-quote="Geoffc" data-source="post: 428274" data-attributes="member: 8705">As distance increases so does depth of field and therefore the focus accuracy becomes less critical. I do my long lenses at about 25' as that's where I experience the problem. Also, on a zoom you adjust at the focal length you are likely to use as it only fully affects one setting.On my lenses I've had it as much as -20.Sent from my iPad using Tapatalk HD</blockquote>