This DT SAL-1650 – 16-50mm with an F2.8 constant Aperture, telephoto zoom has an innovative optical design and maintains a large F2.8 maximum aperture with consistently outstanding contrast and image quality throughout the zoom range.
The large maximum aperture and circular aperture design deliver smooth, natural defocusing effects, while built-in SSM (Super Sonic wave Motor) drive ensures responsive, quiet autofocus performance. The model looks a lot like a Carl Zeiss full frame lens, but Zeiss’ involvement in the design is merely speculation.
As focal lengths get longer, lenses built with conventional optical glass have difficulties with chromatic aberration, and as a result images suffer from lower contrast, lower color quality, and lower resolution. ED glass dramatically reduces chromatic aberration at telephoto ranges, and provides superior contrast across the entire image, even at large aperture settings. Super ED glass provides enhanced compensation for chromatic aberration.
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