The pentax 55 300mm f4 58 ed wr da lens black is a versatile weather resistant telephoto k mount zoom lens covering an extensive focal length from 845mm to 460mm in the 35mm format the lens features high definition coating two ed extra low dispersion glass elements in its optics to minimise chromatic aberrations throughout the entire zoom range and deliver sharp images with a high level of contrast and detail the solid weather resistant construction ensures a reliable performance in al