'Photos Jean are beautiful', that's what I mean since I use this lens! I assure you it is true. With my nikkor 18-55 or worse the Sigma 18-200, I was disappointed every time. the images were pretty, well, that's all. Admit that you sometimes struggle to see the difference between a picture taken with your Nikon case and superb vulgar digital pocket your cousin !!! But with fixed focal length and aperture of 1.8 (better 1.4) the difference is instantaneous. Now I make photos that are alive. we touch the substance of the eyes, the skin takes on a real aspect is wonderful for quilting, rendering materials. This is absolutely essential to work with such bright fixed lens, and what a pleasure to really make the photo, to compensate the limits of the fixed focal length by the imagination of the composition of the image. remember that it is in restraint that one creates better: see Bach and counterpoint (the musicians understand).