Overall, the DX detector edge performance for Sigma is a bit better than Nikkor’s but still worse than Zeiss’s. From that aperture value all the images, even in the corner of the DX sensor, are very sharp and for the middle focal range are even outstandingly so. On stopping down to f/4.0, we get rid of all the problems. Only the Zeiss had no problems in crossing that border for the range of 24-45 mm and obtained a result of almost 34 lpmm. We must immediately mention, though, that neither the Nikkor nor the Canon managed that trick. The maximum relative aperture performance is the only thing we can carp about because the 30 lpmm level hasn’t been reached at any of the tested focal lengths. The edge of the DX detector performance is presented in the following chart. Looking at the real images you can hardly notice any difference between this lens and the Nikkor or the Zeiss – if you do notice it, it will be only at maximum aperture. Do not forget that the Sigma is the cheapest, the smallest and the lightest lens of all compared here so it deserves a round of applause. ![]() Even if we take into account the fact, that the Canon was tested on a sensor the least densely packed with pixels, so we would have to increase its MTF 50 values by 10%, the results are still worse at all focal lengths. ![]() The Sigma was definitely better than the oldest of them all, the Canon 24-70 mm, for a change. Nikkor was a tad worse than Zeiss but still better than Sigma. The second lens is a class of its own because the results of over 40 lpmm were optained even at maximum aperture. The frame center picture quality is beyond reproach, especially that, on stopping down by one stop, we get a brilliant 40 lpmm level or better at every focal length! At shorter focal lengths by f/4 – f/5.6 the results are on the 44-45 lpmm level – even good “primes” would be proud of them.Ĭan we find any fault in the Sigma? Perhaps it’s not a fault but it’s worth notice that the Sigma is slightly worse than the Nikkor and the Zeiss. The weakest results we get at 70 mm but even there the 34 lpmm value can be considered as good. The maximum relative aperture is fully useful at all focal lengths and gives us images definitely sharp. Let’s start with the praises because the Sigma certainly deserves them. The funds are going to be used for paying our editorial team, renting servers, and equipping our testing studio only that way we will be able to continue providing you interesting content for free. If you enjoy our reviews and articles, and you want us to continue our work please, support our website by donating through PayPal. The MTF 50 values chart, depending on the aperture value, for the center of the Nikkon D200 frame, is presented below. The measurement errors oscillated between 0.2 and 1.1 lpmm. ![]() The biggest Sigma’s competitors, namely the Canon 24-70 mm, the Nikkor 24-70 mm and the Sony/Zeiss 24-70 mm have been tested on smaller APS-C/DX sensors (a Canon 20D, a Nikon D200 and a Sony A200 cameras respectively) which allows us to compare the frame center and the frame corner performance directly. The Sigma 24-70 mm f/2.8 was tested by using the RAW files from a Nikkon D200 and D3x cameras. You can change your consents to the use of cookies at any given time. In this document you can find more information concerning browser settings and the way we and our social network, advertising and analytics partners process your data. ![]() If you fail to do so you should be aware that we are going to process your data according to our Privacy Policy. You can switch cookies off by adjusting your browser settings so if you donât agree with our cookie policy please, change your browser settings or leave our website. Our partners might combine information, obtained on this site, with other data they get from you as you make use of their services while surfing the internet. Information about your browsing habits is shared with our social network, advertising and analytics partners. As in the case of almost all other websites, cookies help us to personalize ads, offering you the most relevant information, allow you to share pages with social networks, make our services work as you expect and, overall, help us to monitor and improve our performance.
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