ISO Iriar 3.5/12.5cm prototype

Extremely rare Italian ISO telephoto lens prototype in rangefinder-coupled M36 screw mount for the ISO Bilux camera. This experimental lens, known only from a 1951 ISO advertisement and believed never to have gone into series production, is preserved in exceptional, near-mint condition. The coated optics show only faint traces of previously removed fungus. The set includes the original ISO metal front cap, a special rear cap containing a rare 12.5 cm finder adapter, and the original green maker’s box.