Pentax K-50 Operating Manual page 273

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Press the shutter release button fully again.
Exposure ends.
When [Timed Exposure] is enabled, shooting ends automatically after
the set [Exposure Time] has elapsed.
• When you do not want the indicators on the GPS unit to turn on while
shooting with the ASTROTRACER function, you can turn them off by
selecting the OFF icon for [GPS LED Indicators] in Step 3.
• Refer to the manual of the GPS unit for details on ASTROTRACER.
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