The Pentax 55mm f/4 lens is a moderate wide angle.
Pentax lenses have been developed using the latest in computer-assisted optical design technology. Lens surfaces are treated with Pentax's exclusive Super-Multi-Coating for sharp, high-contrast images
Popular wide-angle lens for the Pentax 67 system
Useful as a wide-normal lens
Equivalent to a 28mm lens in the 35mm format, the Pentax 55mm lens offers a slightly wider view than the 75mm lens without excessive perspective distortion