No ULs have been set for potassium from dietary sources. For infants 0-12 months, the source of intake should be breast milk, formula and food only. For children, adolescents and adults, including pregnant and lactating women, supplements should be taken only under medical supervision.
Autofocus is a mechanism in an optical system which automatic ally changes the optics to focus an image. In a camera, this is used to focus the subject image, through the lens, onto the focal plane-the film or digital sensor. Autofocus MethodsEdit ... Autofocus Evolution.
1 AF-Lock. 2  AF stands for autofocus, and AF-lock is the easiest of these lock functions to use. 3  It's also the only one of the three that happens automatically when you take any photo. 4  AF-lock is activated by pressing the shutter button halfway. Other cameras allow you to assign FE-lock to a Custom Function button. 2  It can be useful to use FE-lock with reflective surfaces, which can fool flash metering, or with photos where the subject is not covered by a focus point. 3  AF-Lock. 4  AF stands for autofocus, and AF-lock is the easiest of these lock functions to use.