The Pentax SMC DA 18-250mm f/3.5-6.3 ED AL IF is the versatile, all-in-one lens for everyday use. The Pentax SMC DA 18-250mm f/3.5-6.3 ED AL IF is a compact, lightweight lens with ultra power zoom specific for Pentax DSLRs with APS-C size sensors. It's 18-250mm focal range is equivalent to 27-375mm in 35mm format. Concerting advanced optical technology the Pentax SMC DA 18-250mm f/3.5-6.3 ED AL IF offers one low dispersion glass element, one Anomalous Dispersion (AD) and two hybrid aspherical lens elements. Its internal surface coatings minimizes ghosting and flare. It also features zoom lock to prevent lens extension when carrying the lens.