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=12pxImages taken with the Sigma lens are essentially free of distortions
畸变=0.00977% 基本等于0
The Sigma lens is a full format lens and as such in enjoys a sweet spot advantage when used on APS-C DSLRs. However, there's still a moderate amount of light falloff at max. aperture (~0.7EV). In very critical scenes you may spot this but it is certainly not worrisome. The vignetting is irrelevant from f/2 onward.
F1.4暗角0.7EV F2光圈 暗角0.21
分辨率
F1.4 全开中心2500线 边缘1970线 其他区域2000线
其他光圈都是2500-2200线 尼玛!!
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结论:
光学4星-4.5星
做工4.5星
性价比5星
高度推荐
Ooops ... they did it again! ;-) Sigma proved once more that they are no longer a company providing budget lenses but are playing in the top league indeed. The Sigma 50mm f/1.4 DG HSM | A (Art series) is a cream-on-the-cappuccino product - at least when used on APS-C DSLRs (well, *hint* it's not bad either on full format DSLRs as well ...). In the APS-C scope it is already very sharp at f/1.4, especially in the image center. The quality is excellent across the entire image frame between f/2.8 and f/8. The lens is also comparatively punchy (high contrast) at large apertures. Lateral CA are basically absent. Same goes for image distortions. Unsurprisingly there are traces of vignetting at f/1.4 but it'll rarely be an issue in the real world. The quality of the bokeh is excellent as far as out-of-focus highlights are concerned. The generally background blur is also smooth, less so the foreground blur. The amount of bokeh fringing is typical for a lens in this class. There's a very slight focus shift when shopping down. However, the focus point mostly kept within the increasing depth-of-field except at really close focus distances.It's no news anymore that Sigma's Art series lenses are both beautifully crafted as well as tough and it's really a joy to handle Sigma 50mm f/1.4 DG HSM | A. The AF is very fast and near silent. Don't expect speed wonders in live-view mode though.So, in summary, "Highly Recommended", of course! Now ... that being said - is it also worth it ? Well, it is mostly better than the Canon EF 50mm f/1.2 USM L II when ignoring the difference in speed at least. It is also superior to the rather dated Canon EF 50mm f/1.4 USM but that's primarily at large aperture settings, less so from f/2.8 onward. However, if you invest into such a lens, you'd really like a great performance at f/1.4-f/2 and this is where the Sigma shines compared to the rest of the sanely priced competition really.
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