Pentax (Asahi Pentax) Super-Takumar 50mm f/1.4 (7-Element) Lens
Name/Title
Pentax (Asahi Pentax) Super-Takumar 50mm f/1.4 (7-Element) LensEntry/Object ID
186Tags
IconicDescription
A world-renowned 50mm prime lens utilizing the M42 "Universal" screw mount. This specific unit is the second-generation 7-element version, distinguished from the earlier 8-element version by the position of its red infrared index mark to the left of the "4" on the focus scale. It is historically significant for its use of thorium oxide—a radioactive rare-earth element—infused into the glass to achieve a high refractive index while maintaining low dispersion. Over decades, the thorium causes the internal glass to undergo a chemical change, often resulting in a noticeable amber or yellow "tea-stained" tint. Photographers often prize this tint for the natural warmth it adds to color images and the increased contrast it provides in black and white photography. The lens is celebrated for its mechanical perfection, featuring a scalloped metal focus ring with a legendary "damped" feel that remains a benchmark for manual focus lenses today. While radioactive, the thorium elements are considered safe for normal use, though they are a major point of interest and discussion among vintage lens collectors.Category
Lens