Pentax's A-series wide prime — a manual-focus 24mm f/2.8 with an 'A' aperture setting.
The SMC Pentax-A 24mm f/2.8 is a wide-angle prime for the Pentax K bayonet mount, from the A-series generation that introduced the 'A' aperture position for program and shutter-priority modes on compatible Pentax bodies. It updated the earlier 24mm with electrical aperture control.
This is a manual-focus lens with a 24mm focal length and a maximum aperture of f/2.8, carrying Super Multi Coating and an 'A' setting that hands diaphragm control to the camera. Element count and filter thread should be confirmed on the specific lens rather than assumed.
At 24mm with an f/2.8 aperture the lens covers landscape, architecture, travel and street work, with enough speed for indoor and lower-light shooting. The wide rectilinear field keeps vertical lines straight for building and interior shots.
A-series primes are sought after because the 'A' contact lets aperture automation work on later Pentax film and digital bodies. Check that the 'A' position locks in, inspect for haze and fungus, confirm dry aperture blades, and test ring feel. It mounts on Pentax K digital cameras and adapts to mirrorless with an adapter.