3-Way Shootout: Sony 16-35mm f/2.8 GM vs Sony 12-24mm f/4 G vs Sigma 14-24mm f/2.8 DG DN Art @ 18mm: Mosaic (Sony A7R IV)
This series compares the Sigma 14-24mm f/2.8 DG DN Art against the Sony 16-35mm f/2.8 GM and Sony 12-24mm f/4 G from f/2.8 through f/8 on an extremely demanding target: a planar subject with exceedingly fine detail. This target is among the most demanding any lens can face, mercilessly showing most all lens weaknesses.
Field curvature is of particular interest because at 60MP, small deviations across the field are not so small, and stopping down past f/4 begins to degrade micro contrast from diffraction. Focus shift, even small, can also be a challenge.
Sharpness at 18mm is relatively hard to achieve and has traditionally been a challenge, even for high-grade lenses. The zoom lens that can deliver at 60MP deserves praise.
Also of interest is lens symmetry, which is relatively challenging on a 60MP sensor, which mercilessly shows the slightest flaw. However, lacking stated specifications from Sony, there is no way to be certain that any particular lens skew is the fault of the lens, or the sensor/flange parallelism being off a few microns.
Includes images from f/2.8 to f/8 at up to full camera resolution.