Tamron SP AF 17-50mm f/2.8 XR Di-II VC LD Aspherical (IF) Lens for Nikon DSLR Cameras

The Tamron SP AF17-50mm 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!

film SLR cameras.

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.