Tamron SP A18 Lens Mounting Type: Nikon F

The AF18-250mm F/3.5-6.3 Di-II LD Aspherical (IF) Macro is the ultimate high power zoom boasting the world's greatest zoom ratio of 13.9X, a milestone that Tamron, the pioneer of high power zoom lenses, has achieved by commanding its technologies to further expand the capabilities of high power zoom lenses. To prevent the lens from becoming bulky, the design concept of the AF18-200mm F/3.5-6.3 XI Di-II LD Aspherical (IF) Macro (Model A14), a popular lens among the world's digital SLR users since it is the ideal high power zoom lens, was the basis for this new lens that features an expanded focal length to 250mm at its tele-end. With the new AF18-250mm zoom lens that provides enhanced image quality, Tamron has achieved an astounding 13.9X zoom power, the world's greatest in the class of zoom lenses; yet the increase in size is confined to a mere 0.2mm more in its maximum diameter and just 0.6mm in overall length, in a lens that offers a 388mm ultra telephoto focal length (diagonal angle of view of 6° 23') when converted to the 35mm film format.