Lens construction (group) 12 Lens construction (elements) 15 Number of aperture blades 5 Minimum aperture 22-27 Minimum focus distance (m) 0.5 Maximum magnification (×) 0.19 Filter diameter (mm) 58 Maximum diameter x length (mm) x (mm) 72 x 75 Weight (g) 375 This is the smallest and lightest normal zoom in its class.The multi-group zoom system makes it compact and at the same time provides excellent descriptive performance throughout the entire range of its range.The USM drive system provides quiet, high-speed AF and full-time manual focus.The 2-group inner-focusing system, which changes the amount of the focus extension in the zoom range, achieves a minimum focus distance of 0.5 m at all focal lengths, and the 2-step retractable system prevents vignetting of the built-in flash light and shortens the overall length.