Originally posted by ChatMechant Hey, all. Just got a Da12-24, and I'm pretty stoked. It's my first "good" lens. Thing is, it won't autofocus properly. Unless the subject is like two feet away it just cranks over to infinity, makes a little electronic grunting noise and then won't lock focus, so the shutter won't fire and I get real frustrated. I've worked around this by using AFC, but I would still like to know- what the heck? I've never done the focus adjustment thing, would this be 'back focusing'?
Back focusing, or Front focusing for that matter are exactly what they imply. BF is when your camera locks focus but the true focus point is Behind what you are supposedly focused on. The exact opposite is true for Front Focusing.
A few more details of what you are doing might help troubleshoot your problem. What are you trying to take pictures of, which camera are you using (shouldn't matter), etc. You should certainly be able to focus further away than a couple feet. Have you tried going to MF and just using the focus ring just to make sure the lens will focus at all?