The Astrotracer (O-GPS1) works well with a 300mm lens :): Pentax SLR Talk Forum: Digital Photography Review
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The Astrotracer O-GPS2 on the Pentax K-3 MarkIII - Recommended setting – PENTAX - Official Store
PENTAX: The choice for astrophotography / explore | RICOH IMAGING
Amazon.com : PENTAX O-GPS2 Handy GPS Unit with ASTROTRACER, Simple Navigation, Electronic Compass. Simplified Weather-Resistant Construction (30364) : Electronics
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Getting Started with Astrophotography and the Pentax Astrotracer - Articles and Tips | PentaxForums.com (Mobile)
Discussing real-world applications of the Pentax Astrotracer with Tim Little - Photofocus
PENTAX: The choice for astrophotography / explore | RICOH IMAGING
troubleshooting - Pentax Astrotracer: Lens error on wide angle lenses? - Photography Stack Exchange
PENTAX: The choice for astrophotography / explore | RICOH IMAGING
Pentax K-3 III Review | Neocamera
Fun with Astrotracer: Pentax SLR Talk Forum: Digital Photography Review
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Pentax Astrotracer Guide - 2021 Edition: What it is and How to Use it - MilkyWayPhotographers.com
Pentax k1 Astrotracer – Nightscape Photographer
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Pentax Astrotracer improvements request - Pentax & Ricoh Rumors
