The Astrotracer (O-GPS1) works well with a 300mm lens :): Pentax SLR Talk Forum: Digital Photography Review
Pentax Astrotracer DSLR camera kit - BBC Sky at Night Magazine
K3III astrotracer Type 3 is a beast - PentaxForums.com
Pentax K-1 Mark II Astrophotography Review – Lonely Speck
Astrotracer 3 first try!!!!: Pentax SLR Talk Forum: Digital Photography Review
Sagittarius wide field with Pentax K3ii and Astrotracer (pete_xl) - AstroBin
Discussing real-world applications of the Pentax Astrotracer with Tim Little - Photofocus
PENTAX: The choice for astrophotography / explore | RICOH IMAGING
Pentax K-3 III Review | Neocamera
Five easy steps to better Milky Way images with the Pentax K-1 Astrotracer - Photofocus
Five easy steps to better Milky Way images with the Pentax K-1 Astrotracer - Photofocus
PENTAX GPS unit O-GPS2 Simple astronomical tracking shooting Astrotracer | eBay
PENTAX O-GPS2 Handy GPS Unit with ASTROTRACER, Simple Navigation, Electronic Compass. Simplified Weather-Resistant Construction (30364)
PENTAX: The choice for astrophotography / explore | RICOH IMAGING
Pentax Astrotracer improvements request - Pentax & Ricoh Rumors
The Astrotracer O-GPS2 on the Pentax K-3 MarkIII - Recommended setting
How To: Astrotracer on the Pentax K1
The Milky Way & Pentax Astrotracer - Luke O'Brien Photography
Pentax Astrotracer Post-processing Technique - Luke O'Brien Photography
Pentax Gives the K-1 II the GPS-Free Astrotracer the K-3 III Got Last Year | PetaPixel
Pentax Astrotracer Post-processing Technique - Luke O'Brien Photography
Pentax K-1 Mark II Astrophotography Review – Lonely Speck
