The Tamron SP AF17-50mm f/2.8 XR Di II LD Aspherical Lens is a lightweight and compact standard zoom lens optimized for digital SLR cameras. With a focal length equivalent to approximately 26-78mm in 35mm format, it offers versatility and speed for various photographic situations.

XR (Extra Refractive Index) glass is employed to finely tune the distribution of optical power, effectively minimizing aberrations and achieving exceptional compactness. This design incorporates two hybrid aspherical elements strategically positioned to enhance imaging quality while streamlining the overall optical system for reduced size and weight.

The lens incorporates an LD (Low Dispersion) glass element to effectively counteract on-axis and lateral chromatic aberrations. This feature is crucial for maintaining high optical quality throughout the entire zoom range, ensuring exceptional performance in digital photography.

Peripheral light fall-off is significantly reduced compared to conventional lenses designed for film cameras, resulting in uniformly bright images from the center to the edges.

Through the use of "Internal Surface Coatings" (multiple-layer coatings on cemented surfaces of multiple elements) and advanced multiple-layer coating technology on standard elements, this lens minimizes ghosting and flare caused by reflections from both the front element and the imagers themselves.

The Zoom Lock prevents unwanted barrel extension when carrying the lens/camera combination.

Limited warranty.