Pentax's faster K-mount wide prime — a manual-focus 24mm f/2.8 with Super Multi Coating.
The SMC Pentax 24mm f/2.8 is a wide-angle prime for the Pentax K bayonet mount, from the first-generation K-series range. It sat above the f/3.5 version as the faster 24mm option, giving a brighter viewfinder and more depth-of-field control.
This is a manual-focus lens with a 24mm focal length and a maximum aperture of f/2.8, finished with Pentax's Super Multi Coating. Details such as element count and filter thread should be verified against the individual sample, since Pentax produced several 24mm designs over the K-mount era.
The 24mm wide field with an f/2.8 aperture suits landscape, architecture and street work, and the extra stop over the f/3.5 version helps in lower light and for cleaner subject separation. Rectilinear correction keeps building lines straight across the frame.
Faster wide primes like this hold their value better than slower siblings, so expect a modest premium for clean glass. Look for haze, fungus and coating marks, confirm the aperture blades are free of oil, and check the ring damping. It fits Pentax K digital cameras and adapts to mirrorless with an adapter.