Nice posting and the tip about watching for shimmering is an interesting one. Two other advantages of manual lenses. (1) The focusing mechanisms are designed for manual focus, so not only feel better, but are often easier to control – smoother, with a bit more resistance than autofocus lenses in manual mode. (2) There are specialist adapters, such as the Kipon tilt-shift adapter that convert manual lenses into the equivalent of very expensive til lenses. The Kipon is limited in that it shifts only one way (I would say the wrong way relative to the tilt) but it is nice to have this.