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Message: <blockquote data-quote="aroy" data-source="post: 494333" data-attributes="member: 16090">My take on the Infinity mark is. With AF you need a bit of leeway, as the internal sensor determines the distance. May be the extra throw is to compensate for the sensor/focus pair shifting mechanically.. For faster AF the throw (movement) of the focusing mechanism is as little as possible (as long as the sensor is accurate at small angles). That results in large focus changes for small MF angles. So the actual infinity will be a little vague.If you notice some of the older MF lenses had about 270 degrees of focus ring movement. That made the incremental focus changes easier. My 18-55 has less than 30 degrees and some lenses have even less. In contrast the 105mm F2.8 AIS macro has more than 330 degrees.</blockquote>