This lens is fully compatible with NIKON D3100 and D7500 (both DX format cameras) just like a Nikon original AF-S 50mm f/1.8G lens with one small difference; with the original Nikkor you can intervene directly in the AF mode and correct the sharpness manually, but not with this one; With the YONGNUO, the lens must first be switched to M (manual) mode. Autofocus works fairly quickly and reliably and isn't too loud, as some others have complained about. I'm not entirely satisfied with the sharpness (only at large apertures), but ok, I accept it. Since the 50mm focal length is built for FX format, in DX format it means a focal length of 75mm, so it's a light telephoto and the risk of camera shake is quite high. The camera must therefore be held very still! Otherwise this lens is a very good lens in terms of value for money, with beautiful, realistic colors and (in my opinion) soft and pleasant bokeh. I uploaded some photos here; they were made in "A" mode - aperture priority with an aperture of f1.8. Only the last photo of Schönbrunn Palace was made with f11. Maybe these pictures can help someone with their purchase.