Ricoh PENTAX K-3 Mark III Faq page 10

Q: What kinds of Operation can be performed by touch panel?
A: You can use the touch panel to select functions, set the AF point for shooting,
and perform other operations.
・When not using the touch panel function, set [Monitor Touch Operation] to [Off] in the C3
menu.
You can directly touch the monitor and scroll the menu up or down to select directly.
Q: What is an Eye sencor?
A: The eye sensor detects whether the user is looking through the viewfinder in the standby mode
while shooting with the viewfinder. When the sensor detects the user's eye, the monitor backlight
turns off and the metering starts. The eye sensor may operate when an object is brought close to
it or it is exposed to direst sunlight. It is also used for the automatic brightness adjustment of the
monitor.
Note:
If the sensor part is dirty, the following symptoms may occur.
・No auto adjustment of LCD monitor.
・No photometric interlocking when use finder.
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