Pentax 150-300mm f/5.6 ED (IF) SMC FA 645
This lens features special extra-low dispersion (ED) glass for lifelike and natural colour renditions and for correction of chromatic aberrations and Inner focussing for easy handling and constant centre of gravity. Reduced weight and faster auto focussing are additional advantages to the [IF] design. When used on a PENTAX 645D it has a focal length equivalent to 120-240mm in 35mm format. Compatible with both film and digital PENTAX 645 cameras.