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Message: <blockquote data-quote="pistnbroke" data-source="post: 57998" data-attributes="member: 9514"><p>its quite simple what you are adjusting is the focus system so it gets the image dead on focus on the sensor...you are reducing the manufacturing tolerances ...set up a tape type ruler at 45 deg to the shooting axis ..pull out about 4 ft ....focus on the 2 ft mark at max focal length and biggest  aperture ...view the result... should be in focus equally around the 2 ft mark...if not move the adjuster so its in focus equally around the 4 ft mark.</p></blockquote><p></p>