This is only the rear element for the Schneider 800mm f/12 Apo-Tele-Xenar lens. When exchanged with the 800mm's rear element, the lens group effectively becomes the same as the 600mm f/9 Apo-Tele-Xenar.
- Rear element ONLY
- For use with the Schneider 800mm f/12 Apo-Tele-Xenar lens
- Converts lens to become 600mm f/9 Apo-Tele-Xenar lens