From Manufacturer
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.
As part of the SP series, this is a high-performance lens featuring high design specifications.
Provides life-size 1:1 macro images
Ideal as portrait lens
"Di" design optimized for digital and photo cameras