Sigma A 20 mm f/1.4 DG DN – first impressions and sample images
2. Build quality
The Sigma A 20 f/1.4 mm DG DN sticks out in this group with the complexity of its optics as it features as many as 17 elements. It also offers an aperture with 11 blades. Compared to its reflex camera predecessor there is another difference - you get a normal filter thread, 82 mm in diameter.
In the photo below both new Sigma lenses are positioned next to the reflex camera Sigma A 35 mm f/1.4 DG HSM model.
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Further on, you see an aperture ring, 12 mm wide, mostly covered by ribbing; it features aperture marks ranging from f/16 to f/1.4 and an A value (meaning automatic settings). The ring moves every 1/3 EV stop but you can also make it clickless. Its performance is very comfortable and smooth, simply beyond reproach.
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A manual focus ring, as wide as 38 mm and mostly covered by ribbing, is another part of the barrel of the lens. It is a focus-by-wire mechanism and you won't find any distance or DOF scale on it. Its performance we found very smooth and the ring remains properly damped at the same time. Its focus throw depends on the speed of your turning. When you move the ring faster it amounts to 180 degrees, when you turn it slower you can reach even over 300 degrees. Both these are values allow you very precise settings.
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The lens is weather sealed – splash proof, and dust proof. The front element is also protected against dirt, grease, and moisture retention by hydrophobic coating.
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Buyers get in the box with the lens: two caps, a petal-type hood, and a solid, practical case with a strap.