![]() Processing was done in Lightroom 10.0/CRAW 13.0 from RAW to Adobe Color profile with the built-in lens profile compensating vignetting and CA. Therefore I present another series of test-shots of a city around 1 km away. But performance of lenses also depends on the shooting distance. The Siemens-star test-targets are shot at a distance of 45x focal length (i.e. Sony’s FE 90mm f2.8 Macro G OSS is a tad softer wide open and needs stopping down to f4.0 to reach the level of acuity which the Sigma already produces at f2.8. The test also showed very little field-curvature. ![]() The lens is so sharp indeed that you can see a very slight softening from diffraction already at f8.0. Just the FF-corner is a little bit softer. Performance of Sigma’s 105mm f2.8 DG DN Macro Art in the APS-C image-circle is already excellent at f2.8. Sigma 105mm f2.8 DG DN Macro Art compared 100% crop from center, APS-C-corner, FF-cornerĪbove: Sigma 105mm f2.8 DG DN Macro Art at f5.6 also available at f8.0, f11 So you will not see light fall-off in the corners. White-balance was adjusted to a neutral white and I did some exposure compensation to make the brightness of all crops match. Noise-reduction is set to 0, sharpening to 50/0.5/36/10, with no extra tone, color, or saturation adjustment. Processing was done in Lightroom 10.0/CRAW 13.0 from RAW to Adobe Color profile with the built-in lens profile for Vignette Control and CA compensation applied. Let’s see how this theoretical performance translates into real life results in the sharpness test based on Siemens-stars. It also should be sharper than the Sony wide open (green lines). I’ll show you the real-life performance at 4 mm (center), 13 mm (APS-C-corner), and 20 mm (FF-corner) on a on a 42MP Sony A7R II camera.įrom the charts the new optical construction has lifted resolution and contrast of the Sigma 105mm f2.8 DG DN Macro Art compared to its DSLR sibling. The x-axis displays the distance from the optical axis (=center of the sensor) in mm. Higher values are better (more contrast) and the closer the line-pairs are together the less astigmatism (= resolution depends on the orientation of the test-pattern) the lens has. These MTF charts show the computed lens-performance of lenses wide open without influence of diffraction at 10 line-pairs/mm (red) and 30 lp/mm (green) except for the charts of the Sony where the red lines show the performance at f8.0. Above: Sigma 105mm f2.8 EX DG OS HSM Macro at f2.8
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