Overview

The Pentax Takumar 6x7 400mm f/4 is a medium-format telephoto lens known for its solid build and smooth handling, though it is heavy. Optically, it delivers good sharpness in the center but suffers from softness and chromatic aberration at the edges, especially wide open. It suits photographers who need a long lens for medium format and can manage its weight, but may not satisfy those demanding edge-to-edge sharpness.