| The Tamron SP AF 17-50mm f/2.8 XR Di II LD Aspherical [IF] is a lightweight, compact, fast standard zoom lens designed exclusively for digital SLR cameras. The focal length of this lens is equivalent to approx. 26-78mm in 35mm format. This lens offers an f/2.8 maximum aperture throughout the entire zoom range, to ensure stress-free photographic shots at all focal lengths and distances. Additionally, a broader photographic expression through the use of faster shutter speeds as a result of the maximum aperture offers enhanced photographic pleasure. 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 (e.g. 1D series), or with 35mm film SLR cameras. Features - Optimized for Digital SLR
The use of XR (Extra Refractive Index) glass optimizes the overall distribution of optical power, and also reduces various aberrations to the absolute minimum while achieving remarkable compactness. In addition, suitable positioning of two hybrid aspherical elements serves to maintain imaging performance and to shorten and compress the entire optical system. - LD Glass
An LD (Low Dispersion) glass element is used to accomplish effective compensation of on-axis and lateral chromatic aberrations, a critical factor for enhancing optical quality in digital photography, in order to achieve outstanding optical performance over the entire zoom range. - Enhanced Peripheral Illumination
Peripheral light fall-off is minimized when compared with that of conventional lenses for film cameras, so images are uniformly bright from the center to the periphery. - Internal Surface Coating to Reduce Ghosting and Flare
By employing "Internal Surface Coatings" (i.e., multiple-layer coatings on cemented surfaces of plural elements) and multiple-layer coating technology on ordinary elements, ghosting and flare due to the reflections that occur when light enters through the front element and reflections caused by the imagers themselves are reduced to the absolute minimum. - Zoom Lock Mechanism
The Zoom Lock prevents unwanted barrel extension when carrying the lens/camera combination.
Specifications - Filter Size 67mm
- f/Stop Range 2.8-? (not specified)
- Minimum Focus Distance 10.6" (27 cm) [entire zoom range]
- Magnification 1:4.5
- Angle of View 78 to 31 (APS-C size equivalent)
- Groups/Elements 13/16
- Length 3.2" (82mm)
- Maximum Diameter 2.9" (74mm)
- Weight 15.3 oz (434 g)
Includes - Tamron SP AF17-50MM F/2.8 XR Di II LD Aspherical [IF]
- 67mm Push-On Lens Cap
- Rear Lens Cap
- Lens Hood
Reviews Award - EUROPEAN CONSUMER LENS
Tamron SP AF 17 - 50mm F/2.8 XR Di II LD
Tamron SP AF17-50mm F/2.8 XR Di II Wins EISA Photo Award - European Consumer Lens of the Year 2006-2007 August 17, 2006, Omiya, Japan—The SP AF17-50mm F/2.8 XR Di II LD Aspherical (IF) (Model A16), a lightweight, compact and fast zoom lens designed for exclusive use with digital SLR cameras equipped with APS-C sized image sensors, which was launched by Tamron on May 15, 2006, has been selected as the winner of the EISA Photo Award – European Consumer Lens of the Year 2006-2007. 
Tamron’s latest lens brings a new level of performance in optical design. It is a very compact all-round lens for everyday use. It is very fast, providing an aperture of 2.8 at all focal lengths and yet it is still light and very easy to handle. It focuses quickly with no hunting. Furthermore, its low price makes it very attractive for enthusiasts on a budget. | 
