DT Lens Design for optimum performance with APS-C DSLRs Superb wide-angle to mid-range telephoto shots Wide f/2.8 aperture for fast response and strong depth-of-field Super Sonic wave Motor for fast, quiet autofocus Frame up the perfect shot while composing on the go for less editing later with a quality A-mount zoom lens designed specifically for use with APS-C size sensors Frame up the perfect shot while composing on the go for less editing later. Get amazing wide-angle to mid-range telephoto shots with beautifully defined colors that make reliving the moment magical. Enjoy fast response and strong depth-of-field thanks to the wide f/2.8 aperture. ED Glass ensures brilliant shots with a wide array of color or try out Circular Aperture for pleasing defocused effects. DT Lens Design A more compact llens designed specifically for use with APS-C size sensors. ED (Extra-low Dispersion) Glass To reduce chromatic aberration at telephoto extension, correcting certain wavelengths of light for sharp, clear images with well defined colors. Wide f/2.8 aperture The SAL1650 features a large f/2.8 aperture for fast response and superb depth-of-field. Circular Aperture 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 To correct visual aberrations at wide-angle setting, enabling a lightweight lens to capture more visually accurate wide-angle shots.