Thank you for viewing. This is a zoom lens with an F4.5 aperture. Minolta at the time made their lenses from glass. It still produces wonderful images even when used with a current SONY A camera. Since the maximum aperture is a reasonable 4.5, it produces sharp images. There is slight haze when a strong LED light is shone through it, but this does not affect the photos. #Minolta #Sony #SONY #filmcamera #digitalcamera #Nikon #Canon #Leica