While I am waiting for autumn's showpieces to position themselves in front and above my S-SW facing fourth floor balcony under a severely (also) light polluted sky, I still have fun training my 350mm Tamron mirror lens and Astrotracer around the Summer Triangle. Maximum allowable exposure times seems to be shorter and still, stars are often a bit more elongated than when I am in the country side.
I guess I do have a problem of magnetic anomalies here, but nonetheless I can capture targets such as:
Planetary nebula M57 in Lyra. Ten exposures of 20s at ISO 1600 stacked in Deep Sky Stacker and post-processed in PhotoImpact. Globular Cluster M56 in Lyra. Eleven exposures of 20s and five exposures of 12s, all at ISO 1600, stacked in DSS and post-processed in PhotoImpact.
OK, stars aren't perfect circular dots, but anyway: How else would I get such pictures with camera on a fixed tripod
and a long lens, that would otherwise produce unguided / "untraced" images like this:
Single exposure of 20s at ISO 1600. Note the less than perfect seeing.
All images shown above are 100% non-resized crops. Click on images to see the objects in their "natural habitat" (100% crops downsized to 55%).
To me this is confirmation that the O-GPS1 and Astrotracer is indeed a fine little travel and/or grab-and-go companion.