Construction:9 Groups/ 12 Elements Diaphragm: 7 bladesAngle of view:108° 44' - 60° 20' (APS-C size equivalent)Closest Focusing Distance:0.24m (9.45'') (entire zoom range)Maximum Magnification:1:5.1 (at f=24mm)Filter Size:77mmDimensions (Length x Diameter):3.4 in. x 3.3 in. (86.5mm x 83.2mm)Weight:370g (13.1 oz.)Notes:Minimum Aperture F/22・Compact Ultra Wide-angle Zoom Lens Covering a Broad Range from 10mm to 24mm The new Tamron zoom covers a focal length range equivalent to 16-37mm* when converted to a 35mm full-size format. (*Tamron's conversion ratio is 1.5x.)・Optical Design Optimized for Digital Camera Characteristics Ensures High OpticalPerformance・Ultra Compact and Lightweight Design・Minimum Focus Distance of 0.24m throughout the Entire Zoom Range・Flower-shaped Lens Hood・New External Design Conveying ''High Performance High Precision Image'' on the Basis of Tamron's Conventional Lens DesignThe new SP AF10-24mm F/3.5-4.5 Di II LD Aspherical (IF) is an advanced ultra wide-angle zoom lens that is versatile and offers even higher performance and specifications than the current Tamron SP AF11-18mm F/4.5-5.6 zoom lens. The lens covers an extended focal length range that is particularly wide for an ultra wide-angle zoom lens while improving the aperture to F/3.5-4.5 and keeping the filter diameter to 77mm. Its lightweight and compact size makes this new wide-angle zoom very user friendly. The lens was designed for use with digital SLR cameras and thereby employs special optical glass materials for outstanding optical performance such as large-aperture glass-molded aspherical elements and hybrid aspherical elements.