I have never been able to get a sharp image at 1.8 with this lens. Once I get to 2.8 and higher, it'll sharpen up, but 1.8 is just unusable. Today I tried an experiment. I focused on something further back in the frame, and what I actually wanted in focus WAS in focus. Look at this image, I have marked a red X on the focus point. I know it's not perfect, but when I focus on the face, it's a complete blur. There is no sharpening on this image, it's just converted from RAW to JPG. This is a USA les, less than 2 years old. Is this something Nikon will fix free of charge? Is it even worth it considering the value of the lens?