The Sony DT 18-200mm f/3.5-6.3 Zoom Lens for NEX Camera is a can-do lens-- an 11x 27-300mm (35mm equivalent) zoom that can handle everything from wide landscape photos to portraits to sports, action and even wildlife photography with the telephoto up to 300mm. And the results will be brilliant, with ED (Extra-low Dispersion) glass that minimizes flare and greatly reduces chromatic aberration, fast internal focusing, 13 groups and 15 elements (including aspherical elements that correct visual aberrations across the entire zoom range), and a circular aperture for more pleasing out-of-focus areas. This lens is not recommended for use with full-frame DSLRs.
Internal Focusing System
Internal lens elements move when focusing, so the overall length does not change -- creating a lens that focuses more quickly and doesn't change balance.
Because aperture blades form a near circle at the wide openings used for low-light shots, spot-light sources have a pleasing circular defocused effect.
Aspherical Lens Elements
Three aspherical elements correct visual aberrations more effectively across the entire zoom range and help reduce weight.
ED (Extra-low Dispersion) Glass
Two ED Glass lenses minimize flare and greatly reduce chromatic aberration, giving you sharp, clear shots even at full telephoto extension.
Advisory When Using DT Lenses With Full-Frame (35mm Equivalent) DSLR Cameras
Sony α (alpha) lenses with the Digital Technology (DT) designation are ideal for use on APS-C size DSLR cameras and are not recommended for use with full frame DSLR camera bodies (such as the DSLR-A900). Although DT lenses can be used with full frame cameras, they can only realize a maximum of 11MP image size (when using the DSLR-A900), and are not guaranteed to provide accurate Auto Exposure performance.