Very concise paper, Kurt, thank you for posting the link. Ann House and I are still planning to illuminate each other from across the valley with our green, and red, lasers, (a distance of around 9 or 10 miles) just to see what the effect looks like- well beyond any hazard range, and well under and away from any aircraft. We may inadvertantly illuminate a bat, pigeon, or seagull. I'm thinking of some imaging options as well, to create a more durable and lasting record, but this is still speculative. More a curiosity exercise than having any claim to science. (Poke it with a stick!) We already know what headlights look like from far away. The bottom line is, keep the beam out of the eyes, and if they offend the astro-imager, either establish some enforceable yet fair rules, or image from private property. It's been said before, when lasers are outlawed, only outlaws will have lasers. Narrowband laser safety glasses have existed for decades. The well-equipped pilot could keep a pair handy for added peace-of-mind, in the event they are subjected to abuse by an irresponsible user. Can 'laser registration' be far in the future? __________________________________ Yahoo! Mail - PC Magazine Editors' Choice 2005 http://mail.yahoo.com