Sigma 14mm f/1.8 DG HSM Art Aperture Series: Clearing Storm over Tenaya Dome
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This series tests performance at distance across the field in an a lighting situation in which the sun is also casting non-image-forming light into the lens. It is thus not only a test of sharpness, but also of flare and contrast under difficult conditions.
Color correction is also evaluated, both for longitudinal and lateral chromatic aberration.
Sigma 14mm f/1.8 DG HSM Art Aperture Series: Clearing Storm Over Tenaya Dome
Includes images up to full camera resolution, and several crops, all from f/1.8 through f/11.
The performance seen here is impressive for a 14mm lens.