Is this normal??? I AM A BIT WORRIED

Hello all, The other day i noticed that the paper ring holding my LXD55 Schimdt Newtonian was a bit out, so I opened the outside ring and placed it well, as many of you know I am a bit of a trouble maker, so I turned my corrector plate a bit but then I positioned it almost exactly as it was, (I marked the real position), and centered the corrector plate to the OTA. I then collimated my telescope, with my sight, and with my laser collimator, but noticed a comma in Jupiter and some little comas in some stars, but this were almost unvisible, the one in jupiter at 32x was quite obvious. Is it normal in some nights no to see this comma???or is it my telescope bad?, does it have any effect on my telescope that I misplaced my corrector plate just a few mm???. I also noticed yesterday that I was looking to the moon there was a slight comma, I was seeing it only with my naked eye and my new glasses on, is this normal? or maybe my glasses are the one with the problem, I have astigmatism.

Thanks a lot for your advice, clear skies.

Ricardo R. Amador

Correction:

"paper ring holding my LXD55 Schimdt Newtonian was a bit out" is "paper ring holding my LXD55 Schimdt Newtonian's corrector plate" was a bit out

Cheers

Ricardo R. Amador

Ricardo, Schmidt-corrector in combination with spherical mirror is quite sensitive to decenter. Even a few mm off can result in more than 1/2 wave worth of center-field coma, and that can be noticed with bright star-like objects even at low magnifications. You'll probably have to correct the decenter through trial-and-error process. It is possible that these Schmidt-Newtonians have diagonal offsetted within the corrector. In such case, the diagonal would be not in the middle of the aperture opening, but somewhat farther away from the focuser side. The amount of offset is nearly approximated by A/4F, where "A" is the minor axis, and "F" the f#. You could try that first. But, before you start fiddling with it, it is probably better to triple check the collimation.