Forgot to mention it weighs 1lb 3.5 oz, is roughly 7" long and yes that is a 7" lens not a 6" so its 18"-56" effective focal length. Oh and I adjusted some film speeds to account for the light loss at the expteme end. Not allowing for reciprocity, The EI for 400 Tmax will be (drum roll) EI 1.5 So much for "Moonrise over Hernandez" with this lens. Les