Pentax's compact A-series standard zoom — a manual-focus 35-70mm f/4 with a constant aperture.
The SMC Pentax-A 35-70mm f/4 is a standard zoom for the Pentax K bayonet mount, from the A-series generation with the 'A' aperture position for program and shutter-priority automation. It was a compact everyday zoom covering the range around normal focal lengths.
This is a manual-focus lens with a 35-70mm zoom range and a constant maximum aperture of f/4 across that range. It carries Super Multi Coating and an 'A' setting for camera-controlled aperture. Exact construction and filter thread should be confirmed on the specific sample.
The 35-70mm span runs from mild wide to short portrait length, making it a practical single-lens choice for travel, street, casual portraits and general use. The constant f/4 aperture keeps exposure steady through the zoom range.
Compact A-series standard zooms are common and inexpensive, and their small size makes them easy to adapt. Check the zoom and focus for smooth action and any wobble, inspect for haze, dust and fungus, and confirm the aperture blades are dry. It fits Pentax K digital bodies and adapts to mirrorless.