Autofocus zoom reaching from normal focal length to moderate tele. When used on the PENTAX 645D the angle of view corresponds to approximately a 64-128mm lens in the 24x36 format. It features SMC (super multi coating) super multi coating is standard for all PENTAX lenses. SMC describes seven microscopically thin layers of high quality coatings that are applied to the lens elements. SMC coatings significantly increase the amount of light transmitted by the lens. This lens also features a ghost-less coating to help prevent ghost images. Compatible with both film and digital PENTAX 645 cameras.