Measurements: High score and high peak sharpness
It is available now for around $899 (USD). Externally, it uses metal and what Sigma calls a Thermally Stable Composite (TSC) material in the construction, and appears to be on par with Canon L-series lenses in terms of build quality.
#Hsmworks review manual
Like the earlier Art series models, it has a sonic-type (HSM) AF motor for smooth and near-silent AF, with full-time manual focus override, and it is compatible the firm’s innovative USB dock, allowing AF focus tuning. Control of axial (longitudinal) chromatic aberration was also a high priority with this model, and the company explains that it is reduced by careful matching of converging and diverging lenses however, the 20mm also adopts two FLD (fluorite-like) elements and five ED glass elements to further reduce color fringing. The company says the new 20mm is highly-corrected for sagittal coma flare through the adoption of an optimized layout and aspherical elements. The latest model in the lineup, the 20mm f1.4 DG HSM A is intended to complement the latest high- resolution full- frame DSLRs, and incorporates a complex optical construction consisting of 15 elements in 11 groups. At the pinnacle of the company’s Global Vision strategy - the reorganization of products into three distinct groups - the Art series has been designed from the get-go as an alternative to the best that the camera brands can offer.
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