Sigma A 35 mm f/1.4 DG DN – first impressions
3. Autofocus and some remarks concerning optical properties
CEO of Sigma, Kazuto Yamaki, during his pre-release presentation of the new lens emphasized the fact that its performance against bright light was optimized. Optics specialists paid special attention to light reflections from the optics and from parts of the body as well. The Sigma company employs a special team that do simulations of unwanted light artifacts; a drawing below shows a result of such a simulation for reflections from an inner construction of the lens.
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Photos below show clearly that the constructors didn't manage to elliminate all light reflection problems. If you stop down the lens more significantly you can catch colourful flares with ease, especially when the sun is situated inside the frame. As you move the sun a bit outside you get a whole net of radial yellow rays of light; after moving the frame even further from the source of bright light your photos might feature a greenish spot in the corner.
Here Sigma optics specialists performed weaker than their counterparts who constructed the Sony 1.4/35 GM – that lens performed very well against bright light and didn't show almost any reflections.