Reviews and Problems with Sigma 15-30mm F3.5-4.5 EX DG ASPHERICAL
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Sigma Wide Angle Zoom AF 15 to 30mm f3.5 to 4.5 EX DG Aspherical And AF 20 to 40mm f2.8 EX DG Aspherical
1 April 2001
Excerpt: The Sigma engineers never seem to take a break, coming up with new lenses with surprising frequency. Late last year, they released two short zooms that certainly attracted a lot of attention. Their AF 15-30mm f/3.5-4.5 EX DG Aspherical boasts the shortest focal length of any zoom on the market, at the time of this writing. The new AF 20-40mm f/2.8 EX DG Aspherical is less unusual but includes the longest focal length of any f/2.8 ultra-wide zoom.