I found some dark skies a little less than an hour and a half away. The type 3 astrotracer unequivocally works better than the GPS based. I do wish that it didn't need to do a test frame for every shot. If the camera had an accelerometer and could read focal length it would be able to tell if you changed anything between shots. Anyways, the K3-III with the 70-200 got better shots than the K-1 with the sigma 50-500, even though I just did the type three astro upgrade to the K-1. Here are some shots of our nearest extraglactic neighbor for comparison purposes https://www.flickr.com/photos/ellarsee/albums/72177720320021774/ -- Larry Colen lrc@red4est.com. sent from Mirkwood