Tamron AF 90mm f/2.8 Di SP A/M 1:1 Macro Lens for Pentax Digital SLR Cameras

Di: Digitally Integrated Design, is a designation Tamron puts on lenses featuring optical systems designed to meet the performance characteristics of digital SLR cameras. DI Lenses have the following benefits Improved Resolution Minimized peripheral light fall-off Compensation of ghosting and flare reduction of chromatic aberations Tamron's 90mm macro lens, often referred to as "the portrait macro" and loved by photographers all over the world, is now reborn as a Di lens that is perfect for use with both film and digital cameras.