> I just tried to order a couple & they're sold out of both the PD-3 and PD-4 > detectors. Rats. :( If anyone finds another source of large detectors, please let us know! I gave up on laser experimentation two years ago because of my total lack of ability to hit the focal point with a .1" square PD! Grrr. 73, -- Paul Kelley N1BUG