Sigma 100-300mm f/4.0 EX DG (Pentax AF) £763.18
This telephoto zoom lens provides a large F4 aperture at all focal lengths. With minimal light-fall-off, superior peripheral brightness is ensured. It's the ideal lens for digital SLR cameras.SLD (Special Low Dispersion) glass for high image qualityThis lens uses two pieces of SLD glass elements in the front lens group and another two in the rear group for excellent correction of chromatic aberration. High optic performance is demonstrate