There should be a forward facing light led that can be used to help with af and also as a catch light.
See page 52 of the manual.
Quote: AF Spot Beam with LED
This flash unit features a built-in white spot beam projector of
LED to assist the autofocus system in dim light and
low-contrast conditions. When using the flash with autofocus in
such conditions, the spot beam will be projected automatically
depending on the ambient lighting conditions. This function is
activated only when the camera is set to autofocus.
1 Turn on the power switch (ON).
2 Press and hold the function button ( ).
3 Rotate the adjustment dial to display Sb on the LCD panel.
4 Press the setting button (SET) to blink 1/1, 1/2 or OFF.
1/1: Maximum brightness. (Default setting)
1/2: Minimum brightness.
OFF: Turn off AF spot beam.
5 Rotate the adjustment dial to select 1/1, 1/2 or OFF.
6 Press the setting button (SET) to complete the setting.
• To exit the function menu, press and hold the function
button ( ).
7 Turn on the camera and set the camera to the autofocus
mode.
8 Press the shutter release button halfway down to let the AF
spot beam discharge.
• The AF spot beam does not work in bright light conditions.
• If the In-focus indicator does not light up in several
seconds, it means that the subject is hard to autofocus. In
this case, use the manual focus mode to focus on the
subject.
• To change the composition, raise your finger off the
shutter release button and press it halfway down again to
recompose the picture.
• When using this flash unit’s built-in AF spot beam, the
built-in AF spot beam of the camera will not operate.
• The AF spot beam on the flash unit works accurately only
when mounted onto the camera’s hot shoe.
---------- Post added 05-30-16 at 03:25 PM ----------
Also please note:
Quote: • Camera models marketed after September 2013 can use
the LED beam as the AF-assist spot beam for the phase
difference autofocus method. This feature can also be
made available on the models listed below, by
downloading the necessary firmware at the following
URL.
http://www.ricoh-imaging.co.jp/english/support/download
_digital.html
You may also contact your nearest service center for
firmware updates. (Charged service)
Supported models:
645D, K-5 II /s, K-5, K-30, K-50, K-500, K-r
Since this manual was created, the k-3, k-3ii, k-s1, ks-1, k-1 have all been released and should work.