Svårslaget även sett till prestanda Från popphotos test av gluggen: IN THE LAB: Our optical-bench SQF tests confirmed what our source at Sigma in Japan confided: This is probably the sharpest lens in the current Sigma lineup. SQF numbers showed sharpness and contrast in the Excellent range, with noticeably better performance, especially at higher magnification, than, for example, Canon's recently tested (and superb) 60mm EF-S 1:1 lens. In fact, the Sigma is one of only a handful of lenses today that pulls down SQF numbers within the 90th percentile all the way out to our maximum magnification (20x24 inches)