I just realized that the "Catch-in Focus" operation only works with true manual focus lenses but not (regrettably!) when just turning AF off. (
Update: Turns out that lenses with a AF/MF switch can be used as well!)
So, if you have a case where you need to rely on a "Catch-in Focus" shooting method, you actually want to have an old lens. Lucky for you that they're cheap (well, usually, unless you want that A* 300 f/2.8 monster)!
An example where I believe "Catch-in Focus" is useful:
When shooting moving objects, e.g. insects in flight (dragonflies), because there you cannot use AF, as it's too slow and would too often try to focus on the background. Instead, you need to preset your focus and shoot at the right moment, using burst mode, preferrably. With the "Catch-in Focus", however, you can just hold down the finger on the shutter and wait for the object to come into focus.
Well, at least that's the theory. Has anyone tried and succeeded in this, or is the focus detection too slow to react? (I'd try myself but I waste all my time with technical experiments at home.)
Last edited by tempelorg; 07-02-2014 at 01:54 PM.