Tamron SP AF90mm f/2.8 Di 1:1 Macro Lens

Tamron AF prime 90mm f/2.8 Di SP AF/MF 1:1 Macro Lens for Nikon Digital SLR Cameras. SP AF90mm F/2.8 Di Features DI Digitally Integrated Design (DI), is a designation Tamron puts on lenses featuring optical systems designed to meet the performance characteristics of digital SLR cameras. Super Performance (SP) for Discriminating Shooters Tamron SP (Super Performance) series is a line of ultra-high-performance lenses designed and manufactured to the exacting specifications demanded by professionals and others who require the highest possible image quality. In creating SP lenses Tamron’s optical designers put their foremost priority on achieving superior performance parameters—they are all designed to a higher standard with little regard for cost constraints. As a result, Tamron lenses bearing the SP designation feature impressive and innovative designs that have established an enviable reputation for excellence among those knowledgeable photographers that demand the very best. Auto-focus/Manual-focus (AF/MF) Switch Mechanism on the Focus Ring The ability to switch quickly between auto-focus (AF) and manual-focus (MF) is a great asset in many types of shooting, especially sports and nature photography. This is easily accomplished with Tamron’s ingenious AF/MF system. By simply sliding the focus ring back and forth between the two positions you can select either the AF or MF focusing position. In manual-focus mode Tamron lenses provide smooth, precise manual focusing by turning their wide, well-textured focusing rings.