Compare Tamron A09 for Nikon to Tamron A16 for Sony

The new Tamron SP AF28-75mm f/2.8 XR LD Aspherical [IF] Macro utilises the XR size-reduction technology developed for the AF28-200mm XR Super Zoom (Model A03) and AF28-300 XR Ultra Zoom (Model A06) to create a fast standard zoom lens. Furthermore, the XR design contributes to the lens almost unbelievably compact size for a lens of this type featuring a filter diameter of 67mm, maximum diameter of 73mm (2.9"), and length of only 92mm (3.6"). And at only 510g (17.99 oz), the image of fast standard zooms as heavy and cumbersome is turned on its head. This lens represents the first in a new category - a fast standard zoom that can be used comfortably as the lens regularly attached to a camera body. In addition, to meet the needs of this dual-format (film and digital) world, the optical system of the lens is designed to provide optimum performance when used with the latest digital SLR cameras. 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