I'd like to get the collected wisdom of the group...
Last night it was supposed to be clear with pretty good seeing conditions...but the forecast was wrong as usual. It started out pretty clear before some puffy intermittent clouds started rolling in.
Nevertheless I was able to take some star images, did a very careful polar align with Pempro, and also did some PEC training before packing it in.
I'd like to hear what people think of the below star images. The images are:
1. A single 5min LUM image of a mag 2 star near the meridian
2. The same bright star as above but defocused and heavily stretched to show another nearby star
3. The same bright star defocused, no stretching.
To the practiced people here, what do these images show? In particular, I'm curious why all of the stars in the 5min image appear to be eggs in one direction. (For info, guiding was quite good with an RMS error of around 0.35 in both RA and DEC.) Is that coma, and does the bright star reflection, which goes in the same direction, indicate that the primary needs to be adjusted slightly?
I should also note that I took some 5s and 30s images and the stars in those images also look like eggs in the same direction.
Edited by buckeyestargazer, 13 May 2017 - 01:31 PM.