Reviews and Problems with Sigma 18-35mm f/1.8 DC HSM
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Sigma 18-35mm F1.8 DC HSM "Art"
2 November 2014
Summary: Ever since the industry-shattering announcement of the Sigma 18-35mm F1.8 HSM "Art," we couldn't wait to get our hands on a copy. Month after month of delays and pushed back release dates it finally arrived, and what an exciting time it was.
Pros: Constant F1.8 aperture throughout zoom range, Excellent build quality throughout the lens' construction, Large focus and zoom rings are perfectly dampened and easy to find and grasp, Capable of shallow-depth of field wide angle portraits, The only fast and wide angle solution for Pentax's many fa...
Cons: Not weather-sealed despite excellent build quality and both internal zoom and focusing, Dreadful autofocus accuracy when using PDAF (looking through viewfinder), Bokeh can be jarring with highlights, producing "frog-egg" or "donut" ring bokeh, Stark color, temperature, and contrast shift from wid...
Sigma 18-35mm f/1.8 DC HSM | A ("Art") - Review / Test Report
15 November 2013
Conclusion: A few years back we used to *sigh* when a Sigma lens found its way into our labs. However, these days are gone really. Nowadays we are usually wondering in how far Sigma is going to embarrass the competition once more and the Sigma 18-35mm f/1.8 DC HSM | A ("Art" Series) was no exception here.