Comparison of Sigma 18-50dc dn Sony 1670 and 1655G?

In terms of image quality, Sigma 18-50dc and Sony E 16-55G both belong to PAS-C large aperture lens. E 16-55G has a moderate zoom ratio and excellent image quality, but the wide-angle end is distorted, especially when shooting at close range, and there is obvious barrel distortion when turning off the camera for correction or directly using RAW. The picture quality of Sigma 18-50dc is quite satisfactory, which is very good. There is no obvious image quality damage, but there is a slight dark angle phenomenon at the maximum aperture of the wide-angle end, which can disappear by reducing an aperture. However, this lens has the smallest zoom range and is a bit inconvenient to use.

Sony E 16-70mm F4 ZA, thanks to Zeiss, the imaging quality of this lens is also remarkable. Although it is smaller than the first two lenses by an aperture, the image quality is also very good, but the phenomenon of dark corner at the wide-angle end is obvious, with slight barrel distortion, while the telephoto end has inconspicuous pillow distortion. The advantage of this lens is its wide zoom range, which is equivalent to 24~ 105mm of a 35mm camera, and it is easier to hang up. And its anti-glare ability is better than the first two lenses, which may benefit from Zeiss's famous T* coating. Now this lens is very new, the new one is about 2000 yuan, and the cost performance is very high.