A compact macro-focus lens that covers the full range from life-size to infinity. Life size macro imaging means that the image you capture is the same size as the subject in reality giving you spectacularly sharp photos of insects, flowers, gemstones, postage stamps and other small nature subjects and collectibles. Mounted on the Sony DSLR-A100 camera, this lens provides a 75mm focal length (35mm equivalent) which means it can also be used as a standard and midrange telephoto lens. Focus Hold Button - For full creative control, a focus hold button located on the lens can lock auto-focusing Auto Clutch - In auto-focus mode, the manual focus ring does not rotate which improves handling ease Circular Aperture - Because aperture blades form a near circle at the wide openings used for low-light shots, spot-light sources have a pleasing circular defocused effect 50mm f/2.8 Macro Lens Focal Length 35mm Equivalent - 50 mm Min Focus Distance - 7.8 inch (20 cm) Aperture Maximum - f2.8 Aperture Minimum - f32 Maximum Magnification - 1.0x Lens Construction - 7 elements in 6 groups with 7 aperture blades Filter Diameter - 55 mm Dimensions - 2-13/16 x 2-3/8 inch (71 x 60 mm) Weight - 10-3/8 ounces (295 gram)