Tom One way to determine the true cause is to have Frank do the survey using your telescope and see what he comes up with. Rick Tejera Editor SACnews Saguaro Astronomy Club Phoenix, Arizona 1 - Poor optics in the 20-inch, which were demonstrated later that night by a lousy view of Saturn. At 400x, the star discs are larger than they could be with good optics, so you can't see as faint. 2 - Frank's eyes are 17 years younger than mine. I want the answer to be #1, of course. Tom --- This message is from the AZ-Observing mailing list. If you wish to be removed from this list, send E-mail to: AZ-Observing-request@xxxxxxxxxxxxx, with the subject: unsubscribe. The list's archive is at: //www.freelists.org/archives/az-observing This is a discussion list. Please send personal inquiries directly to the message author. In other words, do not use "reply" for personal messages. Thanks.