Pentax R-315(N) Instruction Manual page 29

PENTAX R-300 (p20-52)
[Target sighting by Auto focus]
The Auto focus of R-300 series has following two modes.
1. Normal mode
2. Continuous mode : Pressing AF buttons for two seconds beeps, and releasing
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: Pressing AF button focuses on the target.
the key enters into the Continuous mode. This mode
enables you to perform the Auto focus approx. for one
minutes only by sighting through the telescope and
following the target.
3 PREPARATION FOR SURVEYING
Normal mode : Press the AF button.
Continuous mode : Pressing AF buttons for two
seconds beeps and release the key.
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