The Tamron AF18-200mm F/3.5-6.3 XR Di-II LD Aspherical (IF) MACRO is a high power zoom lens designed exclusively for digital SLR cameras using the more compact (APS-C) digital size image sensors. The focal length of this lens is equivalent to approx. 28-300mm in 35mm format.
Designed as an "all-in-one" lens, it will meet almost all photographic opportunities without changing lenses.
The 18-200mm zoom lens realizes an MFD (Minimum Focus Distance)
of 1.5' (45 cm) over the entire zoom range by the employment of a new
optical/mechanical design configuration. Since the maximum magnification
ratio at f=200mm is 1:3.7, you can enjoy close-up photography easily
Note: Di-II lenses cannot be used with digital SLR cameras using
image sensors that are larger than that of an APS-C size imager, or with
35mm film SLR cameras.