Originally posted by Hattifnatt Just curious, why do you think that? I don't shoot portraits that much, but I wanna start improving my technique on this subject. I thought it's the other way around. I use MF almost all the time for my landscape shots.
There are two points in mind about MF versus AF for portrait lenses:
1. Portrait models should pose and sit still long enough for the photographer to focus. In other words, portrait models, like landscapes, ought to sit still for you. With most landscape work, you don't need to focus anyway--you can devote attention to finding and framing interesting views, set lens on infinity, and shoot away. With portraits, it is not quite that simple, although I do sometimes use "catch in focus" for groups and use the same focal settings for several different groups. With CIF, you do not need to manually focus at all, just move slightly forward or backward until the camera finds the focus. I would not use CIF on face-only portraits, but would use manual focus to catch the eyes.
One point, however, it is generally better to use a MF lens with a nice large and comfortable focussing ring. Many of the AF lens are not at all well designed for manual focus because the ring is tiny and uncomfortble to use or is loose and doesn't hold focus well, or changes focus too rapidly to make fine gradations of focus.
2. AF is problematical for portraits because you would normally want to focus on the eyes, and this is easier to do with MF than with AF. AF will tend to focus on the nose, in my experience.
So . . . for portraits, I always use MF even when using a lens that has AF available.
For full body "portraits," if that is what you want to call it, AF is probably okay since close focus on eyes is not needed, or at least less important. For action/activity "portraits," if that is what you want to call them, AF is actually better since nailing an exact manual focus is difficult and in many of these situations, you only have one chance.
For weddings, I would still use MF prime lens for full body shots of bride and groom as well as for group shots. Coming down the aisle, I would go with auto focus. At the reception, I would switch to autofocus and something like Tamron 17-50 f 2.8 zoom lens because in crowded rooms it may be hard to get the right distance from the subject using a prime lens.
All this is just based on my own personal experience and way of working, so it is entirely possble that others think quite differently about these matters.