Pentax R-315(N) Instruction Manual page 32

PENTAX R-300 (p20-52)
3 PREPARATION FOR SURVEYING
[Auto focus :Target sighting by Power focus mode]
q Loosen the telescope clamp and horizontal clamp screws.
w Point the telescope at the target using a collimator.
e Tighten the above two screws.
r Adjust the eyepiece.
t Look through the telescope, and then operate the Power focus key and focus
on the target.
y Align the reticle accurately on the target using telescope and horizontal
tangent screws.
Tilting the Power focus key "clockwise" makes it possible to focus on closer
objects and "counterclockwise" will focus on farther objects.
Tilting angle of the Power focus key makes it possible to perform following
three focusing speeds.
Low speed
Middle speed : When tilted fully by approx. 10 degrees
High speed
Operating the Power focus key rotates the AF ring, so do not touch it
while it is rotating.
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: When tilted to middle position by approx. 5 degrees
: When tilted fully by approx. 10 degrees and passed one
second
Collimator
Power focus key
Target sighting
Target
Collimator