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q There is a possibility that correct distance measurement may be impossible by
dispersion or reduction of laser beam when the laser beam comes into the
target from diagonal angle.
w There is a possibility that the instrument cannot calculate correctly when
receiving reflected laser beam from forth and back directions in case of
measuring the target on the road.
e There is a possibility that synthesized values are calculated and the distance
may become longer or shorter than the actual one when the operator
measures the target of slope or sphere or rugged shape.
r There is a possibility that the instrument cannot calculate correctly collecting
the reflected laser beam from a man or a car that comes and goes in front of
the target.
2. Distance measurement by Reflector sheet mode
Position the Reflector sheet whose reflecting surface faces the aiming line to be
approx. right angle when the distance is measured by it. If it is positioned not to
be approx. right angle, there is a possibility that correct distance measurement
may be impossible by dispersion or reduction of laser beam.
3. Applied measurement range by Each target mode
● (Reflectorless (Non-Prism) mode):
It can measure the distance by Reflector sheet and Prism, but the measurable
distance is less than 200m.
● Reflector sheet mode:
It can measure the distance by Prism mode, but the measurable distance is
less than 1000m.
● Prism mode:
It can measure by Reflector sheet as well.
● Reflector sheet mode and Prism mode:
It is sometimes possible to measure without reflector sheet or prism under
special conditions like in the close distance, targeting on a wall surface.
However, there is a possibility including some errors in this case, so be sure
to select the Reflectorless mode.
● The target Constant should be correctly selected and confirmed in case that
the Reflector sheet is used at the Prism mode and the Prism is used at the
Reflector sheet mode.
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6 DISTANCE MEASUREMENT
PENTAX R-300 (p20-52) 10/30/02 11:08 AM Page 43