Pentax Pentax-A 70-200mm f/4 - Pentax K Mount

The Pentax-A 70-200mm f/4 is a constant-aperture manual focus telephoto zoom lens. Part of the 'A' series, it allows for automatic exposure control on compatible Pentax SLR bodies. The f/4 maximum aperture provides a brighter viewfinder image and better background separation compared to variable aperture zooms. Its two-ring design allows for precise independent control of zoom and focus. Potential buyers should check for internal haze and the presence of fungus, particularly in the rear groups. SDS ensures the aperture ring moves freely and that the 'A' lock is fully functional. The focus ring should have a smooth, dampened feel; any grit or inconsistent resistance usually indicates aged lubricants or internal debris. Verify the filter thread is not dented, as this is a common point of impact.