The Tamron 18-200mm F/3.5-6.3 Di III VC Lens for Sony E Mount Cameras (Silver) made for the Sony E mount camera system incorporates a stepping motor that is optimal for the contrast-detection AF system of Sony mirrorless interchangeable-lens cameras. This will also improve AF when shooting video. With the motor built into the lens, focusing will be quieter and more responsive.
The 18-200mm f/3.5-6.3 Di III VC 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. 27-300mm in 35mm format.
Designed as an "all-in-one" lens, it meets 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 and conveniently.
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.