To save battery power, your dSLR doesn’t start to focus the lens until you partially depress the shutter release. But, autofocus isn’t some mindless beast out there snapping your pictures in and out of focus with no feedback from you after you press that button.
Continuous autofocus. The chief drawbacks of this system are that [...]
As with exposure, digital cameras use different kinds of methods to collect focus information and then evaluate it to produce the correct focus. The image will be in sharp focus at the position of highest contrast. An autofocus system may rely on the ambient illumination on the subject, or use a special autofocus light source [...]
With manual focus, you twist the focus ring on your lens until the image you want pops into sharp focus. Many dSLRs have a cool feature: Even if you’re focusing manually, a focus indicator LED may light up when you’ve achieved correct focus, giving you some helpful extra confirmation. Some points to consider about manual [...]
