Canon 10 x 30 IS Technology Guide - Page 18

Wide field of view, with superior image quality overall. Uses a doublet field-flattener. The image quality around the edges is a very important point to look at when selecting binoculars. If binoculars with inferior image quality are used for an extended period of time, the user will tire easily and may even become sick. The IS series use the world's first doublet field-flattener lens (Fig. 9). This is Canon's exclusive optical design with two field-flattener lenses, lenses which are normally reserved for high-grade binoculars. By using two lenses, Canon has achieved a wide field of view of 67˚ (12x36 IS, 15x50 IS ALL WEATHER, 18x50 IS ALL WEATHER), with unrivaled sharpness. Object lens Vari-angle prism Roof prism Eye lens (Right side: Moves when adjusting for sight differences between the left and right eyes) UD lens Moves when adjusting the focus Direction of movement of the e(yFeigl.e6n)s 76mm (Fig. 6) You can enjoy the power and sharp image . 18