Pentax's M42 wide-angle — SMC Takumar 28mm f/3.5 for classic film and adapted mirrorless use.
The Pentax SMC Takumar 28mm f/3.5 is a manual-focus wide prime for M42 screw mount, released in various versions from approximately the 1960s. Six elements in 6 groups with SMC coating. Six aperture blades. 49mm filter thread. At approximately 180g. 0.40m MFD.
Six elements in 6 groups (SMC Super Multi Coating). Six aperture blades. The 49mm filter thread. At approximately 180g. Minimum focus distance of 0.40m. Manual focus only. f/3.5 maximum aperture. Full-frame coverage. Pentax M42 screw mount.
The Takumar 28mm f/3.5 was Pentax's compact wide prime for the Spotmatic and M42-mount camera system: the SMC coating provides reduced flare in contrasty backlit conditions. The 28mm perspective provides a moderate wide field for environmental and architectural photography on full-frame. The M42 universal screw mount enables broad adapter compatibility.
On the used market the Pentax SMC Takumar 28mm f/3.5 is very affordable as a vintage M42 wide prime. Condition checks: focus helicoid smoothness, 49mm front element for marks, aperture blades for oil. Manual focus only. M42 screw mount — adaptable to most modern systems via M42 adapter.