Hi AJ, I don't do much astrophotography, so can't really comment on the impact of LP's in that arena. I do know that they're easy to see through the eyepiece of a telescope and against a darkened sky. A laissez faire approach--like that taken with flashlights, music, etc.--seems worth trying. As long as folks use them responsibly and in a non-intrusive manner, there's no need for an outright ban. And just as you might do if somebody was playing loud music or using a bright lantern, guests should feel comfortable walking over to the next telescope and asking an LP user for some consideration. Regards, Bill in Flagstaff -- See message header for info on list archives or unsubscribing, and please send personal replies to the author, not the list.