From Leica Wiki (English)
- Code names - SFTOO - 12035-feet version - 12034-metric version
- Production era - 1938-1984
- Type - Mini-telescope rangefinder / viewfinder for f = 20 cm 1:4 Telyt and f = 20 cm 1:4.5 Telyt. Fits in accessory shoe of camera or PLOOT and can be used on the extension tube TZFOO for use with Telyt 20 cm lenses without Visoflex
- Variants - Metric and feet versions; early version with "20cm" and later with "200mm" engravings.
- Forum discussion