Overview

The Carl Zeiss Jena Triotar 135mm f/4 is a vintage triplet-design telephoto lens known for excellent bokeh and soft portrait rendering. Its sharpness is modest wide open but improves significantly by f/5.6, peaking at f/8 with good center resolution, though edge performance drops quickly. Build quality varies: early versions have all-metal construction, while later ones feature preset aperture and scalloped focus rings. Common issues include stiff focus and internal haze. It suits portrait photographers seeking a classic, soft look on a budget, but collectors may pay premium prices for pristine examples.