The Tamron 28-75mm f/2.8 XR Di LD Aspherical (IF) Autofocus Lens for Nikon is a high-speed standard zoom lens. With a fast 2.8 aperture, this lens is suitable for low-light situations. A motor is incorporated into the lens so that AF is functional even on older Nikon cameras, like the D40 and D40x. This lens is ideal for event shooting, weddings, travel, street photography, and everyday shooting. The wide end is suitable for groups while the long end is great for portrait work.