Carl Zeiss Jena Triotar 135mm f/4

Carl Zeiss Jena Triotar 135mm f/4

The Carl Zeiss Jena Triotar 135mm f/4 is a coated three-element telephoto documented in a rare, rangefinder-coupled Leica thread mount. Its simple three-group triplet design is combined with a fifteen-blade diaphragm and chrome barrel.

Optical qualities

Rendering

The three-element, three-group Cooke triplet construction produces a direct, characterful rendering with smooth background separation. Central definition can be strong, while contrast and edge performance improve when stopped down. The fifteen-blade iris preserves a rounded opening through much of the aperture range.

Handling

Dedicated references list a 1.5 m minimum focus for the early coated generation. The original LTM barrel is rangefinder-coupled, making it distinct from the far more common Exakta, M42 and Praktina versions. Exterior dimensions and filter size are left blank because mount-specific values remain unverified.

History

Development and Launch

Carl Zeiss Jena introduced the Triotar 135mm f/4 before the war and offered the coated T generation from the mid-1940s. The Leica screw execution is one of the rarest factory mount variants.

Production Evolution

Early lenses use manual aperture control and chrome construction. Later SLR versions adopted preset mechanisms and revised barrels, but retained the basic triplet formula.

Special Editions/Variants

Mount and barrel changes are substantial across the wider Triotar family. This profile applies only to the coupled Leica thread version and should not absorb M42 or Exakta examples.

Collector Notes

The coupled M39 focusing mount, red T coating mark and original chrome construction are the primary identification points. Many apparently similar lenses are SLR versions or detached lens heads.