1. haptics
The housing of the new 50mm 1.8G is indeed made of plastic, but very grade and processed to still excellent. It rattles and nothing wobbles. It's a bit bulkier than the old 50s, but about the same weight. Unlike the Nikon AF Nikkor 50mm 1: 1,8D lens (52mm filter thread) is included even a lens hood that snaps tired and also consists of quality plastic. Furthermore, there is a lens pouch to two full and objective caps. In terms-included accessories the 1.8G is clear before 1.8D.
2. Image quality
2.1 Sharpness
If the focus is located on the Punbkt that 1.8G is knackscharf. However, I had to carry on my D7000 an AF fine tuning, because I had to find a back focus. But I laste at rather the somewhat bitchy AF the D7000, as the lens. Compared with the 1.8D the 1.8G is minimal sharper. But the difference is noticeable only in 100% views, and the pixel-peeping. In practice, both lenses when it comes to sharpness equivalent.
2.2 Resolution
The 1.8G is offenblendig something soft and in need of improvement with regard to the resolution. One hides but only slightly, the resolution increases sharply. Even at f / 2.2, the resolution at a high level and between f / 4 and f / 8 is the resolution can be nothing to be desired. The 1.8D behaves as basically the same, however, is located opposite the 1.8G back always easy.
2.3 Distortion
In practice, no distortion is noticeable; not with two lenses. So it should be with a fixed focal length also.
2.3 CAs
Chromatic aberrations occur every now and then, however, by processing software, such as Adobe Photoshop Lightroom 4 WIN & MAC, easily correctable. However, they occur less than even the 1.8D; here is a clear progress can be seen.
2.4 Bokeh
The Bokeh of 1.8G is that of 1.8D very similar, but only up to about f /. 4 While the 1.8D with further dimming starts to become restless and gets polygonal circles of confusion, the 1.8G remains soft for longer and retains the roundness of Blurred circles. Even at f / 8 the bokeh is still presentable. When it comes to the Bokeh 1.8G wins clearly.
2.5 Contrast / Color
The colors are reproduced more lively with the 1.8G, as the 1.8D, which is sometimes a bit queasy. However, this criticism does when photographing with RAW hardly a role, because you can improve saturation, and contrast in retrospect. Therefore, I just want to mention this fact, but let unweighted.
3. Autofocus
The Auto Focus speed of both lenses is virtually identical to my D7000. However, the autofocus of the 1.8G is quieter due to its ultrasonic motor, than the stan genes exaggerated 1.8D (this only works if the camera has a built-in autofocus motor; on the D5100, for example, does not). In addition, the possibility of manual intervention in the auto focus is very convenient and better than either-or solution in 1.8D. Both lenses can also be manually focusing well, especially with the bright 100% viewfinder of the D7000. Again wins the 1.8G, which can be used due to its quieter and on all (!) Nikon DSLR Autofokusses.
CONCLUSION
The Nikon AF-S NIKKOR 50mm 1: 1.8 g in my eyes is definitely a buy recommendation, because you get a lot for your money. For the moment there is plenty of 170 a very good 50mm lens that allows no real weaknesses. Are the (currently) justified 50 premium over the 50mm 1.8D? Yes you are! You not only get a better, more modern lens, but also more inclusive accessories.
Anyone who wants to set a 50mm fixed focal length should look at this objective. The price / performance ratio is extremely good and not to surpass even the 1.8D!