The SP 90mm 1:1 macro lens retains the outstanding optical quality of the highly rated Tamron SP 90mm it succeeds. With emphasis on portability, the lens is now considerably smaller and lighter than before. It boasts high resolving power and sharp image depiction with ideal background blur. The new focusing ring clutch engages and disengages the focusing gear, making the switch between AF and MF a simple slide of the focusing ring forward or back. This mechanism and a wide, smooth focusing ring make delicate manual focusing in the macro mode easy and precise.