http://www.pentaxwebstore.com/detail/PTX+39012O-GPS1
Specifications
TYPE:
Hotshoe mounted accessory GPS unit
SUPPORTED CAMERAS:
K-5, K-r, 645D (as of May, 2011)
RECORDED INFO:
Lat, Lon, Alt, Time (UTC), Direction
GPS RECEIVER:
50 Channel Tracking, Supports SBAS (WAAS/EGNOS/MSAS)
ACQUISITION TIME:
Approx 40 sec (cold), 5 sec (hot)
POSITIONING INTERVAL:
1 sec
GPS ACCURACY:
10m RMS
http://www.pentaximaging.com/about-us.aspx?p=press&pid=PENTAXANNOUNCESO-GPS1UNITFORDIGITALSLRCAMERAS20110531150210Astrotracer for astrophotography
The O-GPS1offers the advanced PENTAX original Astrotracer function,* which works with the PENTAX Shake Reduction (SR) system on select cameras for tracking and photographing celestial bodies. The unit calculates the movement of stars, planets, and other bodies using the latitude obtained from GPS data and the camera’s alignment data (horizontal and vertical inclinations and aspect) obtained from its magnetic and acceleration sensors. Then, the unit shifts the camera’s image sensor in synchronization with the movement of the object(s).** As a result, stars and other bodies are captured as solid points rather than blurry streaks, even during extended exposures. The unit also simplifies astrophotography by requiring only a tripod and eliminating the need for additional accessories such as an equatorial telescope.
* This function is available only when the O-GPS1 is mounted on a PENTAX digital SLR camera body equipped with a magnet-driven SR system.
** The duration of Astrotracer operation may vary depending on photographic conditions.
Simple Navigation to indicate location data to a destination
The O-GPS1 offers a Simple Navigation function, which calculates the direction and distance to a given destination from the current position. Users may locate destinations using location data stored on recorded images or register/assign destinations by uploading location data created on a personal computing device.*
* At the time of purchase, the O-GPS1 has nine PENTAX international service centers as preset destinations.
Electronic Compass function to indicate and record direction
The O-GPS1 features an Electronic Compass function, which displays the camera’s direction on its LCD monitor with great precision. Using the aspect of geomagnetism detected by its magnetic sensor and GPS location data, the unit indicates the aspect in relation to true north. Users may record directional data on captured images.
Additional important features
• Simplified weather-resistant construction for use in light rain.
• Independent power source (one AAA-size battery) eliminating the need to draw power from the camera body.
PENTAX, K-5, K-r, and 645D are trademarks of HOYA CORPORATION.
Google and Google Earth are either registered trademarks or trademarks of Google, Inc.
All other brands or product names are trademarks or registered trademarks of their respective companies.
Design and Specifications are subject to change without notice.
觀星工具 
