Left 4.5" lens, bottom is concave, some chips along the edge
Middle, 3.5" aspherical lens, PCS flat bottom side
Right, the same 3.5" aspherical lens still mounted in the bezel. it has mounting rings and cab be, the bazel diameter is ~5"
These lens came out of Bausch & Lomb stage spotlight, very high optical quality, better than what you get from DX or Edmund optics
The focal length is longer than typical aspharical lens. The two lens can be combined together to reduce focal length & achieve 4.5" lens power with bigger spot for dual aspherical lens projection spot light mod, or used them as giant magnifier lens to zap some bugs.
Back, giant 8" reflector mirror from Cruis Hinds searchlight used in my Swan Blaster project, when paired with a rear facing DLP projector lamp, it did 16 million cpse
asking $65 shipped will make a nice bug zapper
