Pentax 02 Standard Zoom Lens for Pentax Q Focal length equivalent to 27.5-83.0mm in 35mm format Maximum variable aperture of f2.8-4.5 Four extra low dispersion (ED) aspherical lens elements keep chromatic aberrations to a minimum throughout its zoom range. Lens shutter features 5 aperture blades and synchs with the Q's built in flash at speeds up to 1/2000 sec Neutral density filter allows for open aperture photography in bright settings