These MTF charts show the computed lens-performance of lenses wide open without influence of diffraction.
Let’s have a look at the theoretical performance of the new Sigma 24-70mm f2.8 DG DN Art first:Ībove: MTF Sigma 24-70mm f2.8 DG DN Art at 24mm, f2.8 (left) and 70mm, f2.8 (right)įor comparison have a look at the MTF charts of the Sony FE 24-70mm f2.8 GM, Tamron 28-75mm f2.8 Di III, Panasonic Lumix 24-70mm f2.8 S Pro, Nikon Z 24-70mm f2.8 S. The following real life shot shows that the Sigma 24-70mm f2.8 DG DN Art produces no purple fringing around high-contrast edges in the focal plane or green outlining around background subjects:Ībove: Sigma 24-70mm f2.8 DG DN Art at 70mm, f2.8 100% crop click image for 4k versionįor comparison see the Tamron 28-75mm f2.8 Di III. For comparison see the Tamron 28-75mm f2.8 Di III, Sony FE 24-70mm f2.8 GM, and Nikon Z 24-70mm f2.8 S. There’s also no focus shift to worry about although the foreground becomes sharper faster than the background – similar to the Sony. Sigma 24-70mm f2.8 DG DN Art Longitudinal Chromatic Aberration (loCA) at 70mmġ00% crops, from top to bottom: f2.8, f4.0, f5.6 left = foreground, right = background These normally show up as magenta coloration in the foreground and greenish hues in the background and are not easily corrected in post-processing. Lenses with focal ratios of f2.8 or larger are often prone to longitudinal color aberrations (loCA, a.k.a. Testing: Longitudinal Chromatic Aberration and focus shift
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