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Photography Q&A
Best AF Mode For Models
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<blockquote data-quote="skater" data-source="post: 491925" data-attributes="member: 19158"><p>Yeah, I don't shoot people often, but even kids can hold still for a few seconds. But I'm not sure I understand the original question - the focus, once it's set on the subject (whether it's a model, a bridge, or anything else) will still be correct even if the model moves up and down or side to side, within reasonable limits. The only time it'll be wrong is if the model moves closer to the camera or farther from the camera, and someone trying to hold still for you won't be moving THAT much. (Focus is a function of distance from the lens.) If they do move enough to mess up the focus, then you've got very low depth of field and parts of their face and/or body are going to be out of focus no matter what you do, which isn't what the OP is going for based on the example posted. </p><p></p><p>So focus shouldn't be such a problem. If the model were running toward (or away) from the camera, the focus would need need to change (and this is what AF-C is for). But static or nearly-static objects? There are several ways to do it, but they all boil down to telling the camera WHAT you want to focus on - in this case, the models. So, set the camera to single-point focus and move the focus point to the models. If your camera doesn't have a focus point on the model given the composition of the picture you want, set it to AF-S and single point focus, focus on the model, then keep holding the trigger down halfway (or use back-button focus and hold it down - this is where BBF becomes much handier), then recompose and snap the picture. This is what AF-S and single point focus is for - it tells the camera to ignore the moving stuff and focus where you said, and hold that focus. </p><p></p><p>Try it without models - focus on something close by, then hold it while you recompose your picture. For what it's worth, I usually only use single-point focus and tell it where I want to focus (i.e., the subject of my picture).</p><p></p><p>Back button focus is nice, but ultimately it's just a different way to trigger the autofocus - I think the question here is more about getting the autofocus to work the way the photographer wants it to.</p></blockquote><p></p>
[QUOTE="skater, post: 491925, member: 19158"] Yeah, I don't shoot people often, but even kids can hold still for a few seconds. But I'm not sure I understand the original question - the focus, once it's set on the subject (whether it's a model, a bridge, or anything else) will still be correct even if the model moves up and down or side to side, within reasonable limits. The only time it'll be wrong is if the model moves closer to the camera or farther from the camera, and someone trying to hold still for you won't be moving THAT much. (Focus is a function of distance from the lens.) If they do move enough to mess up the focus, then you've got very low depth of field and parts of their face and/or body are going to be out of focus no matter what you do, which isn't what the OP is going for based on the example posted. So focus shouldn't be such a problem. If the model were running toward (or away) from the camera, the focus would need need to change (and this is what AF-C is for). But static or nearly-static objects? There are several ways to do it, but they all boil down to telling the camera WHAT you want to focus on - in this case, the models. So, set the camera to single-point focus and move the focus point to the models. If your camera doesn't have a focus point on the model given the composition of the picture you want, set it to AF-S and single point focus, focus on the model, then keep holding the trigger down halfway (or use back-button focus and hold it down - this is where BBF becomes much handier), then recompose and snap the picture. This is what AF-S and single point focus is for - it tells the camera to ignore the moving stuff and focus where you said, and hold that focus. Try it without models - focus on something close by, then hold it while you recompose your picture. For what it's worth, I usually only use single-point focus and tell it where I want to focus (i.e., the subject of my picture). Back button focus is nice, but ultimately it's just a different way to trigger the autofocus - I think the question here is more about getting the autofocus to work the way the photographer wants it to. [/QUOTE]
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