I don't think it affects DOF at all -- I believe it's only used with the camera's auto-focus feature, by taking three (or maybe more) exposures, one where it thinks the correct focus should be, one focused in front of that point, and one just behind it.
This would probably be most useful for handheld macros, where moving the camera just slightly after the auto-focus is set can make the subject go out of focus.
It's for use with manual focus. It is useful with macro shots where the DOF is pretty shallow. My Canon G3 has the same feature. The bracketing adjusts the focus point slightly for each shot.
It's for use with manual focus. It is useful with macro shots where the DOF is pretty shallow. My Canon G3 has the same feature. The bracketing adjusts the focus point slightly for each shot.
I think it only works in autofocus, at least on a dSLR; when you switch to MF that's on the lens itself, and it turns off the motor, so focus bracketing can't work there. But in fact it's very useful for autofocus macros, when you can't be quite sure the autofocus point is precisely where you need it to be. Focus bracketing racks the lens in and out for several different exposures, increasing your chance to get the right focal point.
so why is focus bracketing different from focus lock?
It changes the focal point between shots, so that (hopefully) one of them is in-focus. Same as with exposure-bracketing, where the camera calculates what it thinks is the best exposure, and then also takes one with less and one with more exposure, so that one of them might come out "right."
Focus lock will set the focal point and not change it, even if the camera or subject moves from their original position.
It's for use with manual focus. It is useful with macro shots where the DOF is pretty shallow. My Canon G3 has the same feature. The bracketing adjusts the focus point slightly for each shot.
I think it only works in autofocus, at least on a dSLR; when you switch to MF that's on the lens itself, and it turns off the motor, so focus bracketing can't work there. But in fact it's very useful for autofocus macros, when you can't be quite sure the autofocus point is precisely where you need it to be. Focus bracketing racks the lens in and out for several different exposures, increasing your chance to get the right focal point.
R.
On the P & S it's only in manual focus. On a DSLR it doesn't make sense in manual focus.
