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I do understand the 3 focus modes but I was just wondering when using continues shutter mode the camera does have enough time to focus as well as in single shot mode. Lets put it this way, which one would you use in such situation one shot or continues to get best quality? Assuming that Focus mode is set to Al Servo in both
My impression is that I believe he is asking if the AF can continuously keep up. But that's really relative to the camera and lens being used as well as focus point selected, lighting conditions, speed of your subject etc. It should be just as good in most cases, other than the fact that one shot will not re-focus or track focus without you releasing and re-pressing the AF button.
No, the aperture does not engage until you take the shot. A lens with a very fast minimum aperture ( lower f/stop number ) would be ideal because it allows more light into the camera for focusing. Continuous AF would be ideal, but ONE shot would work as well if you could press and release the AF repeatedly. The main hindrance here would be your possible in-ability to focus on the spot you intend to be sharpest. Most people blame AF when in fact they either focused on the wrong area due to fast movement, or used too wide of an aperture resulting in a very shallow Depth of Field. Also, you misunderstood what I meant when I said choose an AF point. Depending on the camera, some AF points are cross-type and may function better than others. Also, typically the center AF point works the best. Remember, you may consider a movement to be slow based on the field of view given by your eyes, however, depending on focal length, that field of view may become very narrow, so things may seem to move much more. An extreme illustration of this would be trying to keep a 400mm lens locked onto a bird in flight as opposed to keeping a 35mm locked on. Sure the 400mm will be closer, but the 35mm would be a breeze to follow in the viewfinder.
So I just have to make sure that the DoF is enough to cover area that their in but if choose the center AF point, in a crop that covers them from head to toe, wouldn't I loose focus on the face?
So I just have to make sure that the DoF is enough to cover area that their in but if choose the center AF point, in a crop that covers them from head to toe, wouldn't I loose focus on the face?
Yes you would, that was more for general explanation about focus points. Not just for this specific subject. I wasn't saying to use the center, I was saying that which focus point you choose could lead to less accurate AF at times. It depends on your set up also. My 7D with an L lens attached is going to focus much faster and much more accurately than a Canon XSi with a kit lens attached. And yes, you want to be careful with the depth of field. A 85mm lens at f/1.4 is going to require pinpoint accuracy of your focus point and be less forgiving. However, stopping down to say f/4 will give you a little more wiggle room incase you are just barely off the focus point.