Legendary in the world of close-up photography, superior Micro Nikkor performance delivers images of striking clarity while providing reproduction ratios of up to 1:1 without additional accessories. The extra long focal length of this lens provides the most versatile working distance. Extra Low Dispersion (ED) glass ensures apochromatic-like performance, with high contrast and sharper images. Internal focusing improves handling and focusing operation. Focuses from infinity to 19.4 inches (1:1 reproduction ratio). A-M (Automatic-Manual) switch. Read the full test here