Compare Tamron A061 For Canon to Tamron A16 for Sony

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. Less

The SP AF17-50mm F/2.8 is a lightweight, compact, fast standard zoom lens designed exclusively for digital SLR cameras, expanding the product concept of the popular SP AF28-75mm F/2.8 zoom lens. In addition, portrait shots are made beautiful with the natural out-of-focus effect characteristic provided by the fast F/2.8 aperture. Additionally, a broader photographic expression through the use of faster shutter speeds as a result of the maximum aperture offers enhanced photographic pleasure. The lens boasts one of the best close-up shooting performances in the class of fast standard zoom lenses designed exclusively for digital cameras and featuring an F/2.8 maximum aperture throughout the entire zoom range, to ensure stress-free photographic shots at all focal lengths and distances. Less