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13 APPENDIX
84
13-6 Distance Range
Generally speaking, the maximum range which can be measured varies
considerably depending on the atmospheric conditions. For this reason, the
Specifications illustrate the values for both Good and Normal weather conditions.
It is extremely difficult to judge when weather conditions are “Good” and when
they are “Normal”. With this instrument, the conditions noted below are used to
differentiate between the two situations, (Good weather conditions for surveying
are different from Normal weather conditions, and in surveying situations, cloudy
skies are considered more favorable than sunny skies.)
Weather conditions for measurement ranges are based on the following standard
values:
Normal: Visibility of approximately 20 km, with slight shimmer and moderatewind.
Good: Visibility of approximately 40 km, overcast, with no shimmer and
moderate wind.
PENTAX R-300 (p65-88) 10/30/02 11:11 AM Page 84