content: I don't have much to say that hasn't been said before. This is the sharpest lens I own and it has become my "gold standard". The image quality of all of my other lenses get compared to this one.This is also the first lens that I have owned which has exceeded the capabilities of my camera. As I zoom in, my other lenses would lose sharpness before the image would pixelate. With this lens, I was sharp down to the pixel level. This inspired me to upgrade from a 6MP K100DS to a 12MP K-r.The images from this lens are extremely lifelike and the colors are superb. I get more "keepers" using the DA 40mm than with any other lens.