DESC: Tamron's 28-300mm lens is an optical pioneer in more than one sense. Three Hybrid Aspherical elements and two high-grade LD (Low Dispersion) glass elements provide sharpness, contrast and color depth while eliminating chromatic aberrations inherent to a high-power zoom lens of this magnitude. The "Quad-Cam Zoom Mechanism" enables four lens barrels to be extended and retracted effortlessly - achieving compactness at 28mm, while holding precise extension at 300mm.