So last night it finally cleared up here south of Houston. So about 10PM I took the scope out to test it and see how it was. After it warmed up, it was about 83 deg. F outside, I looked at Luna with my ZAO I 10 mm in the focuser. I was totally amazed at the detail, even though the moon was full with no shadows. Saturn looked great as well, although small (90X). So then I thought I would do a star test on Spica. Oh crap! The intra-focal Airy disk was slightly elongated vertically, and when I went through focus, the extra-focal disk was elongated a little bit horizontally. Astigmatism! So I put my ZAO I 6mm in and the disks were perfectly round on both sides. ????
I spent all day today thinking what to do to test it tonight. So I took it out tonight about the same time, and let it warm up. This time I used my Tak Ortho 9mm. I did the Spica star test, and both the extra and intra focal disks were perfectly round. My conclusion is that the highly vaunted ZAO I 10mm that I paid $650 for has astigmatism. I’ll have to take it apart and fix it. Premium eyepiece my behind.
After the Spica star test, I looked at Saturn and Luna, and both looked very detailed. So I went for broke, and brought out my new TOE 4mm. Now cruising along at 80X/per inch. Oh my! I have never seen so much detail on Saturn’s disk and rings, and it was so big. Turning to the moon was just as good. It was huge, there was so much detail, and it seemed like I was in orbit around it.
Finally the focuser. Smooth as butter. This is one fine scope, and some great eyepieces too. The TOE with its larger eye relief, made high power very comfortable to use.