Two large chunks of glass, 83mm diameter, in an aluminium barrel, with a baffle or waterhouse stop between them. Made to gather image from a flat area approx 200 x200mm which is then projected to a screen. Throws an image circle approx 200mm diameter, Weighs 1.7kg. Experiment, shoot for creative fuzz, build a 200mm tele lens, paperweight, it yours for $20 plus postage
