Originally posted by Bagga_Txips That's exactly what I mean, yes. And I have my K-5 set up so that autofocus is triggered by the AF button on the back of the camera, rather than by the shutter release. Thibking about it, that could be very useful, because if I saw an athlete charging towards a photographable situation I could quickly focus to that distance, then wait for the athlete to get there. Here's another idea, and I would need the opinions of people who actually do sports photography - how useful is catch-in-focus for sports shots?
The K-3 has fast autofocus, that's what the reviews suggest, but it's a very expensive camera, and money is usually better spent on better glass.
With a K-5 you can actually use AF-C and follow the athlete (coming toward you) while the camera keeps focus. Of course it will keep going a little out of focus and snap back in focus during this process.
On the K200D I would only have 2 or 3 times I could actually snap the shutter as a runner was coming toward me (because it was out of focus the other times). But this is still better than getting only one opportunity (with Catch In Focus, for example).
On the K-5 it would stay in focus much more regularly.
And the K-5 IIs does even better than that, such that it's rarely far out of focus.
Others report that the K-3 (which I don't have) does even better with AF, and I believe that includes this scenario. But I didn't upgrade to it this year because I thought the K-5 IIs was doing well enough (and I had to invest in video-related equipment instead). So I can't tell you how much difference it might make. But as I said, the K-5 IIs does well already.
I should point out that I always select the focus point myself, rather than having the camera select for me, because I can select the athlete and frame while I shoot. As new groups of runners approach I'll often quickly change my focus point according to what I think will look better with their positions. It's a very active process if you're trying to get interesting shots. In general, if you don't know what your subject is (which athlete you're focusing on) you have no business taking the shot. As long as I keep the focus point on the athlete as he moves the newer cameras keep focus pretty well.
But while runners coming at you is a challenge for the camera's AF speed, field sports might have more lateral and stop and start movements, which could require less re-focusing for the camera. But OTOH, players can move unpredictably, or a closer player might run in front of the camera and throw the focus off. So each sport has its challenges.
To the OP: The bottom line is, IMO, you shouldn't go higher than a K-5 IIs. It's going for a very good price now, and won't depreciate that much more. So if you later disagree with me and think you need a better camera, you can sell it without taking much loss. In the meantime you'll have a very good camera and can invest in 1 or 2 quality lenses. Also, if you shoot in Portrait orientation a lot (I didn't until I shot runners) you can get a 3rd-party Battery Grip for less than $50. Believe me, after taking over 1000 shots in portrait orientation at an event, you'll be ordering one the next day! On the K-3 the Battery Grip is an additional $225, and I
thought I read about some reliability issues with it. Plus the K-3 still has a few significant bugs being worked out (they wouldn't be enough to stop me, but if it were my only camera ... I wouldn't be so happy about it).