Pentax's fast Auto-Takumar 85mm f/1.8 — an early M42 portrait prime prized for its rendering.
The Auto-Takumar 85mm f/1.8 is a fast short-telephoto prime made by Asahi Optical for the M42 screw mount around 1960. It was the fast portrait lens of the early Pentax system and belongs to the Auto-Takumar generation with its semi-automatic diaphragm. As one of the faster Takumars of its day it was a premium item in the range.
This is a manual-focus M42 screw-mount lens with an 85mm focal length and a bright f/1.8 maximum aperture. Focus and aperture are controlled by hand on the barrel and the diaphragm uses the Auto-Takumar semi-automatic system. It is a substantial all-metal lens. Element construction and other detailed figures are not stated here as they are not reliably documented.
The 85mm focal length with its fast f/1.8 aperture is a classic portrait combination, giving a flattering perspective and shallow depth of field for subject isolation. Early fast Takumars of this type render with a smooth, slightly soft signature wide open that suits portraiture, becoming sharper stopped down. It is well liked for the older look it gives faces.
This is a sought-after early Takumar and prices reflect its desirability as a fast portrait lens. Inspect carefully for haze, fungus and coating wear on the larger elements, check the aperture blades for oil, and confirm the semi-automatic diaphragm works. The focus helicoid should be smooth given the longer travel. An M42 adapter suits it well to mirrorless portrait use.