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.
The process of autofocusing generally works as follows: (1) An autofocus processor (AFP) makes a small change in the focusing distance. (2) AFP reads the AF sensor to assess whether and by how much focus has improved. (3) Using the information from (2), the AFP sets the lens to a new focusing distance. (4) The AFP may iteratively repeat steps 2-3 until satisfactory focus has been achieved. This entire process is usually completed within a fraction of a second. For difficult subjects, the camera may fail to achieve satisfactory focus and will give up on repeating the above sequence, resulting in failed autofocus.