Focusing and menu options

If you are used to shooting video with the video mode of a point-and-shoot…camera or with a video camera, then you are used to an autofocus that continuously…updates. The camera constantly refocuses to ensure that your subject stays in…focus, and it does that probably pretty quietly.…Your SLR doesn't work that way.…Your SLR has a much slower autofocus mechanism, so you don't get that continuous…really smooth updating of autofocus.…This means that usually what you will do is autofocus before you start rolling video.…Now my focus is locked.…

I can start rolling video. As long as my camera to subject distance doesn't…change--that is, as long as I don't move the camera in and out, as long as the…subject doesn't move in and out-- everything will stay in focus.…If things start moving around, life gets more complicated.…I've got a couple of options.…I can switch to manual focus and try to follow the action by changing the focus…ring of my camera. That can be a little tricky.…It takes practice to get good at following manually.…