Designed for use with Nikon's iconic Nikonos V underwater camera, the Nikon W-Nikkor IC 35 mm macro lens has a minimum aperture of f/22 and a maximum aperture of f/2.5, providing a wide range of options for varying film types and conditions. It has a minimum focus distance of 33.1 inches, with manual focus and aperture control via two easy-turn knobs on the outside of the lens which make fine tuning an easy task while wearing diving gloves. The W-Nikkor IC 35mm f/2.5 is the recommended lens for use with extension tubes when doing underwater macro photography, with a picture angle of 43 degrees at 30 ft. and 62 degrees on land. This waterproof lens weighs just 6 oz. and measures a mere 2 inches long, making it a convenient to tuck into your camera bag as you head out for a day's shoot, whether by land or by sea.