Remember that the pair I posted yesterday consisted of one Rob took 2.5 hours before mine meaning that by the time I took mine my position on the planet had moved west 2.5 hours towards the spot Rob had taken his. Tonight I've posted pairs made of ones he and I took at the same time, giving us a much longer baseline. This one has the Utah image on the left and the Hawaii image on the right: http://users.wirelessbeehive.com/~paw/temp/stereo/uh.jpg This one is Hawaii left and Utah right: http://users.wirelessbeehive.com/~paw/temp/stereo/hu.jpg Here are the two pairs above stacked one above the other: http://users.wirelessbeehive.com/~paw/temp/stereo/uhhu.jpg And for a control I put this one together with two copies of the Hawaii image: http://users.wirelessbeehive.com/~paw/temp/stereo/hh.jpg I'm seeing the same effect in all, including the one with the two Hawaii images which tells me it's all in my head. :) But seriously, I think it's the same effect many of us have reported when using a binoviewer to view the Moon. It's obviously not stereo but since both eyes are being used it seems to somehow trick the brain into thinking it's seeing stereo. BTW, for those new to the list, I tried another collaboration with another guy in Hawaii (J D Armstrong) a few month back where we both imaged minor planet (3833) Calingasta at the same time. The images were shot with wildly different optical systems (his 2.0 meter vs. my 0.35 meter) so his showed way more stars but the stereo effect was plainly visible: http://users.wirelessbeehive.com/~paw/temp/parallax01.jpg Also for the new folks, here are two shots of the same star field taken 24 hours apart. Take advantage of the stereo effect and Pluto should pop right out at you: http://users.wirelessbeehive.com/~paw/temp/pluto24hour.jpg Carpe Noctem! patrick p.s. Very nice skies tonight. A bit "mooney" but I'm getting some very focused images which tells me the seeing is great.