Pentax SMC Pentax-A 35-70mm f/4 - Pentax K Mount

The SMC Pentax-A 35-70mm f/4 is a constant-aperture standard zoom lens, offering a useful range from wide-angle to portrait focal lengths. Unlike many variable-aperture kit zooms, the f/4 maximum aperture stays consistent, simplifying manual exposure. It features a macro mode at the 70mm end, providing a 1:3 magnification ratio for close-up photography. The lens is well-regarded for its sharpness and relatively low distortion. Check for any play in the zoom barrel and ensure the macro switch engages and disengages smoothly. The optical coatings should be inspected for damage, as the front element is somewhat exposed. SDS technicians test the aperture linkage to ensure the 'A' setting communicates correctly with the camera and check the internal glass for any signs of separation or fogging.