Sigma 20mm DG DN lens for Sony mirrorless Art F1.4 E-mount, prime, wide-angle, full-frame cameras, series.

With a lens configuration of 17 elements in 15 groups, including two SLD glass elements and three aspherical lenses, various aberrations are corrected, achieving high point image reproduction even when shooting at the widest aperture of f/1.4. The image is clear and highly uniform from the center to the edges of the frame without blurring. In particular, the largest double-sided aspherical lens in SIGMA's history thoroughly suppresses sagittal coma flare and field curvature, allowing it to capture every single tiny star from edge to edge of the frame while making the most of the ultra-wide 20mm field of view. The focus mode switch, the AFL button to which any function can be assigned from the camera, the MFL switch to prevent unintended operation, the aperture ring lock switch, and the included petal-shaped lens hood with a locking mechanism to prevent accidental detachment and non-slip rubber parts all support reliable operation in any shooting situation. A "lens heater retainer" is to properly install a lens heater to prevent condensation from forming inside the lens. Sony E-mount 20mm F1.4 Prime wide-angle Mirrorless full-frame