Pentax's SMC Takumar 24mm f/3.5 — a multi-coated M42 wide-angle for landscape and architecture.
The Super-Multi-Coated Takumar 24mm f/3.5 is a wide-angle prime made by Asahi Optical for the M42 screw mount in the early 1970s. It is the multi-coated evolution of the earlier Super-Takumar 24mm, carrying Asahi's Super-Multi-Coating for improved flare control, and served as a popular wide-angle in the Pentax M42 system.
This is a manual-focus M42 screw-mount lens with a 24mm focal length and a maximum aperture of f/3.5. Focus and the automatic diaphragm are set on the barrel in the usual Takumar manner. It is a compact all-metal wide-angle. Optical construction details are not asserted here beyond the verified focal length and aperture in keeping with the accuracy standard.
The 24mm angle of view suits landscapes, architecture, interiors and environmental scenes, with good depth of field at the f/3.5 aperture. The Super-Multi-Coating improves contrast and flare resistance over the single-coated version. It is well regarded for controlled distortion and clean rendering when stopped down, making it a dependable classic wide.
Used copies are moderately priced and popular for adapting to mirrorless. Check the glass for haze, fungus and coating marks, confirm the automatic diaphragm works with dry blades, and test focus feel. Some Takumars use thoriated glass that can yellow; inspect for a tint. An M42 adapter mounts it on modern cameras for wide-angle use.