Compare Pentax smc D FA 50mm f/2.8 Macro Lens to Tamron A16 for Sony

Digital macro lens: The 50mm f/2.9 macro lens is designed especially for digital cameras. It uses curvature and position of optical elements to reduce flare and ghosting for high-quality images. The lens can also be used as a telephoto lens. Compatible with: Pentax SLR manual and digital cameras; optimized for digital Pentax SLRs. 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