The 90mm f/2.8 macro lens boasts high resolving power and sharp image depiction with ideal background blur, making it the ideal lens for close-up and portrait photography. With emphasis on portability, this macro lens is compact and lightweight. A wide, smooth focusing ring makes delicate manual focusing in the macro mode easy and precise. Di (Digitally Integrated Design) is a designation Tamron puts on lenses featuring optical systems designed to also meet the performance characteristics of digital SLR cameras. The "Di" design is achieved by applying a new optical multi-coating to its element surfaces.