After switching to digital SLR, I had a Nikon 35-105mm zoom lens needing a use. I did not have a true macro lens, and bought this closeup lens. Besides giving me almost 1:1 enlargement, I extended the distance from the subject so the lens doesn't cast a shadow from on-camera flash. The pictures are sharp as a tack (probably from using the center of the lens's field), and I am producing saleable closeups of flowers and small wildlife with this combo, extending the lens to 105mm for extreme closeups. The quality is much better than the built-in "macro" setting on the lens itself, probably because the lens is zoomed out for that setting. No vignetting, no distortion perceptible. A fine investment!