This 4.2x zoom is something that no demanding photographer should miss. With a focal length range equivalent to 90 - 380mm (35mm format) and a constant f/4.0 aperture the smc PENTAX DA* 60 - 250mm is truly outstanding in a range of situations, including portraiture, sport or landscape photography. Other high-end details like seals against dust and humidity and inner focusing underline the suitability for challenging outdoor use. A speedy and silent ultrasonic motor easily handles the focusing demands. This new lens is also compatible with cameras without SDM technology.