500mm BOWER Telephoto Lens Kit for Pentax dSLR Models ist, istDL, K10D, K100D, K20D, K200D, K-x, K-r, K-5, K-7 Achromatic refractor 500mm f/8 lens in T-mount Multicoated optics Knurled focus ring to the front of the lens Accepts 67mm filters on the front of the lens Fixed tripod collar