Sigma 40mm f/1.4 DG HSM Art Aperture Series: Blowing Snow on High Peaks (Nikon D850)
See my Sigma DG HSM Art wishlist.
This far distance series evaluates lens performance from f/1.4 through f/11, evaluating sharpness across the frame as well as secondary color correction.
Sigma 40mm f/1.4 DG HSM Art Aperture Series: Blowing Snow on High Peaks (Nikon D850)
Include images up to full camera resolution from f/1.4 to f/11.
Separately, I look at flare with the Sigma 40mm f/1.4 DG HSM Art, and the value of shading the lens from non-image-forming sunlight:
Sigma 40mm f/1.4 DG HSM Art Flare