Bell and Howell Filmovara lens adapter. I don't know much about these other than what I've found on the net; It's a screw fit to a 2 inch lens and gives a variable focal length of 1.5 to 2.5 inches. It is in excellent condition with flawless optics. Made in USA. Ideal for a mancave or even a vintage projection enthusiast! This matches the Super Proval lens I'm also selling. It will be sent by Royal Mail tracked, UK postage only. Thanks for looking.