Schneider 800mm f/12 Apo-Tele-Xenar Rear Group

This is the 800mm "rear group" for the modular Apo-Tele-Xenar. The photographer can use either the 600mm or 800mm rear group to achieve the desired focal length with this modular system. If you own an Apo-Tele-Xenar in the 600mm configuration, you would use this group to add 800mm focal length capability to your system.