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Message: <blockquote data-quote="Marcel" data-source="post: 594894" data-attributes="member: 3903">Sorry to disagree but for focus calibration, the lens should be as open as possible. When you close the aperture, you increase the depth of field, making the precise focus harder to detect.While it's true that most lenses will not be at their sharpest when fully open, it's easier to determine where exactly the focus was made when fully open.But then I've been proven wrong often enough. If you don't believe me, just ask my better half. <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite1" alt=":)" title="Smile    :)" loading="lazy" data-shortname=":)" /></blockquote>