Optimized for close-up shooting, the Pentax K-mount 150mm f/2.8 Macro 1:1 from Irix is a medium telephoto prime featuring a life-size 1:1 maximum magnification and a 1.1' minimum focusing distance for photographing nearby subjects. A bright f/2.8 maximum aperture enables working in a variety of lighting conditions and also offers greater control over depth of field for isolating subject matter. The 12 element, nine group optical design features a Neutrino coating, which helps to suppress lens flare and ghosting in order to achieve higher contrast and color accuracy when working in strong lighting conditions.
Complementing the optical assets is a robust physical construction, dubbed Dragonfly, which incorporates extensive weather sealing to guard against dust and moisture. This manual focus lens also features printed focus distance and depth of field scales to benefit fast and accurate focusing, and a rounded 11-blade diaphragm contributes to a smooth bokeh quality. Additionally, the included tripod collar has an Arca-type compatible foot for seamless compatibility with a variety of tripod heads.