This lens was designed to offer versatile, high-performance macro capabilities in a compact, lightweight body. It is a true 1:1 macro lens with an amazing minimum focus distance of just under 1 inch. Optics/Lens Aperture (Max.) : f/3.5 Aperture (Min.) : f/22 Filter Diameter : 49mm Lens Groups-Elements : 6 groups, 7 elements (3 aspheric surfaces) Minimum Focus Distance : 3.84" (9.5cm) Aspheric Elements : 3 aspheric surface AF for Movie Capture : Yes Aperture Blade : 7 blades (Circular aperture) Dimensions (Max. Diameter x Length) : 2-1/2 x 2-1/4" (62x55.5mm) Direct Manual Focus : Yes Exterior Finish : Metal Focal Length (35mm equivalent) : 45mm Internal Motor : Yes (Stepping motor) Lens Weight : 4 7/8 oz (138g) Low Noise During Movie Capture : Excellent Maximum Magnification : 1.0x (APS-C) Mount Material : Metal