Originally posted by aleonx3 Hi, Will, great question and great answers from all. I am going to ask one more question perhaps related to this focus points. If I set the camera to auto-focus point select, does the camera select multipoints to focus and then determine the optimal aperture to ensure everything within the "selected focus points" are in focus?
I look at the EXIF of pictures taken from one of my relativea who uses a Canon 5D. I was never able to determine where the focus is locked on from his pictures. Hence the pictures from him always look flat to me. Is it the camera or did he relies too much on the auto mode of the camera? Or it could be lens..
I'm not sure what might be wrong (if anything) with your friend's photos from the 5D. I've seen some great photos taken with that camera, although probably most of them weren't taken with the focus set to auto-select point.
As for your first question above, the way I understand it—which I'm going to state here so somebody who actually KNOWS can correct me—is that the camera has a kind of database built into its firmware that helps it analyze the scene's contrast and make a smart guess about where to focus. I don't think it simply looks for the most contrasty point in the photo and decides, "Let's focus there." I suspect that, for a lot of photographers, auto-select point focus might be fine. Might be fine for many of my own photos, in fact. I liked the comment somebody else made here about how you could draw a bull's eye on his photos because the focus was always smack dab in the center. I've been doing this a long time and I don't always compose my shots with the focus in the center—but I like symmetry and classic composition, and I'd bet that the focal plane in my shots is at or near the center at least 50% of the time. The problem is that other 50%. If you're going to take responsibility for it—and I do that partly by focusing with the AF button rather than half-shutter press—then you might as well take responsibility all of the time. After all, when it's easy, it's easy. And when it's a little harder, it's still easier not to have to switch out of "easy mode" (as it were).
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This issue has arisen for me because I've been reconsidering (once again) my modus operandi.
For a long time, I shot mostly in M mode, but I had focus tied to the shutter button, because, to be honest, I wasn't aware that there was an alternative for auto-focus. I learned here how to use the AF button, disconnected autofocus from the shutter and haven't looked back.
But I did change my exposure mode after I discovered the power of hyperprogram (P) mode on the K10D/K20D: it lets me access effective Av or Tv mode quickly simply by moving the rear or front e-dial, and by using the +/- (exposure compensation) button, lets me control what the camera is doing just about as well as M mode does. It took me a while to get used to using P this way, mainly because I found it hard to think in terms of +/- EC, having been used to looking at the meter's gauge. Once I got used to P, however, I liked it. A lot. Actually I thought it was brilliant.
And now I'm going back to M again, or so it seems. This time, I haven't made a conscious decision about it. It just seems to be happening. It's partly because I want to be in M when using flash, and I shoot with flash a lot. If I'm shooting with off-camera flash, I have to be in M. And while the exposure mode system really works quite differently with flash than it does with available light, nevertheless, I have been finding it easier to just stay in M all the time, whether I am using flash or not. I think that I must establish a habitual M.O. and then stick with it. If I have to worry about shutter speed some of the time (when shooting M) and not at other times (when using P as effective Av), well, I'll end up forgetting about shutter speed one day when I should not. It's already happened.
I'd love to have the camera do any part of the job automatically, if I could trust the camera to do it the way I want. But I can't, not with exposure. I asked my question here in this thread because I was wondering if perhaps I could make focusing easier. Guess not.
Will