Review Summary
Reader Score: 7.83 (out of 10)
The 18-50 f/2.8 EX DC is very different from its "slower" sibling. The larger maximum aperture allows more light in and enables higher shutter speeds in equivalent lighting. In terms of construction, the f/2.8 has 15 lens elements in 13 groups, compared to 8 elements in 8 groups for the f/3.5-5.6 version. Notable is the EX designation, reserved for Sigma's higher-performance line of lenses. The lens construction includes a Special Low Dispersion (SLD) glass lens element and two aspherical lens elements: the former compensates for chromatic aberration in images, while the latter deals with various aberrations throughout the entire zoom range.
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Joby Gorillapod Original
