Focal Length: 70-150mm (Medium Telephoto Zoom) Maximum Aperture: F4.5 (constant throughout the zoom range) Mount: M42 Screw Mount Aperture Range: F4.5 - F22 Focus: Manual Focus (no autofocus) Filter Diameter: 58mm There are a few spots of fungus and some dust, but there is no haze and it should not affect the photos. No operational problems.