I had a two-hour run on the DSC last night, Oct 01. At the start of the run, I took a focus frame and noticed that the out-of-focus images were NOT "centered": they have the form of a diffuse ring with a bright spot at one edge. I suspect that the telescope may not be properly collimated. Has anyone else noticed this problem lately? Michael APO APO APO APO APO Apache Point Observatory 3.5m APO APO APO APO APO This is message 7 in the apo35-dsc archive. You can find APO the archive in /u/strauss/apo/mailer/apo35-dsc on astro.princeton.edu APO To join/leave the list, send mail to apo35-request@astro.princeton.edu APO To post a message, mail it to apo35-dsc@astro.princeton.edu APO APO APO APO APO APO APO APO APO APO APO APO APO APO APO APO APO