Sony ILCE-6500 Manual page 281

When the shutter button is pressed and held halfway down, the product tracks the subject within
the selected autofocus area. This setting is available only when the focus mode is set to
[Continuous AF]. Point the cursor at [Lock-on AF] on the [Focus Area] setting screen, and then
adjust the desired area to start tracking using the left/right sides of the control wheel. You can
also move the tracking start area to the desired point by designating the area as a flexible spot
or expand flexible spot.
List of focus range finder frames
The focus range finder frame differs as follows depending on the shooting mode.
When focusing on a larger area
When focusing on a smaller area
When [Focus Area] is set to [Wide] or [Zone] and you aim at a moving subject, the focus
range finder frame for "When focusing on a smaller area" may be displayed.
When you attach an A-mount lens with a Mount Adaptor (LA-EA1 or LA-EA3) (sold
separately) and [
frame for "When focusing on a smaller area" may be displayed.
When focus is achieved automatically based on the whole range of the monitor
When you use a zoom function other than the optical zoom, the [Focus Area] setting is
disabled and the focus area frame is shown by the dotted line. The AF operates with priority
on and around the center area.
AF System] is set to [Phase Detection AF], the focus range finder