> Frank Kraljic did the same thing for a similar length of time with his > 10-inch Spooner Newtonian, also on a tracking platform. He was able to > see the magnitude 16.1 star. The 16.1 magnitude star was difficult to mark, requiring high magnification (400x), definitely requiring averted vision. The first thirty minutes, I struggled to concretely identify a 15.7 mag star just west of M57, and a 15.6 star south of the PN; 15.4 was consistently visible, however once noticed, the 15.7 remained apparent over 50% of the time. I am amazed at the difference in faintness based on tenths of magnitudes. Obviously, the difference is more vast the fainter one goes. Two things I would like to point out: 1) Shrouding my head over the eyepiece with a blanket made a vast jump (in tenths) in magnitude classification. 2) I wonder if M57's surface brightness effects dark adaptation. Would 16.1 be easier to spot if not in the same FOV as the Ring? I remember Brian Skiff has a chart of optimal and expected magnitudes for various apertures. Does anyone (Brian) have a link to that data? -FRANK --- 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.