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Message: <blockquote data-quote="Dave_W" data-source="post: 169703" data-attributes="member: 9521">A fully manual lens will have a much finer focus mechanism and by that I mean you have to turn the focus ring much farther to achieve the same effect as you would with an autofocus lens. This allows the photographer to carefully zero in on the proper focus and will be much less likely to overshoot that spot one way or the other. An autofocus lens, on the other hand, has been designed for speed of focus and thus the turn ratio is much smaller to aid in the focus speed and as a result it's much easier to over and under shoot the proper focus when using it on manual settings. But don't get me wrong, many people use AF lenses on manual, it's not impossible by any means, I just wanted to point out that a true "manual" lens, as in the type you asked for reviews on, is very different than an autofocus lens set on manual mode.</blockquote>