Pentax's K-mount short tele — a manual-focus 105mm f/2.8 with Super Multi Coating.
The SMC Pentax 105mm f/2.8 is a short-telephoto prime for the Pentax K bayonet mount, from the first-generation K-series range. The 105mm sat among the classic portrait-and-detail telephotos just above 100mm in Pentax's lineup.
This is a manual-focus lens with a 105mm focal length and a maximum aperture of f/2.8, carrying Pentax's Super Multi Coating. Details such as element count and filter thread should be confirmed against the specific sample rather than assumed.
At 105mm the short-telephoto perspective flatters portraits and compresses backgrounds, and the f/2.8 aperture gives a shallow depth of field with smooth rendering. It suits portraits, tighter general framing and details from a comfortable working distance.
First-generation K-series telephotos are solidly built and appear on the used market at reasonable prices. Check for haze, fungus and coating scratches, confirm the aperture blades are dry and quick, and test the focus ring for smooth movement. It fits Pentax K digital bodies and adapts to mirrorless with an adapter.