interesting - but with no detector it is a heavy door stop! wonder if the lens material might have some intrinsic "value" simply as a lump of germanium. BTW i have one similar from a first generation thermal imaging system which used to work. it moved the thermal image with a set of rotating optical elements over a fast acting thermocouple referenced to liquid nitrogen and displaying on a crt as something like 60 lines per image and "framing" at about 15 frames per second. These days liquid nitrogen is generally not used anymore as far as i know. Andy On Apr 14, 2011, at 5:09 AM, Karl Shah-Jenner wrote: > http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=130419142918 > > these have got to be rather rare.. >
