EF 24-70mm f/4L IS USM標準變焦鏡頭採用全新研發12組15片鏡片光學設計，配備1片高精確度玻璃鑄模(GMo)非球面鏡片及1片複製(Replica)非球面鏡片，能大大修正變焦時的各種鏡頭像差，為整個焦段及畫面帶來高畫質影像；並加入2片UD超低色散鏡片，能有效改善色差，達致更高解析度及高反差影像。
Canon EF 24-70mm f/4L IS USM A versatile standard zoom well suited to full-frame EOS cameras and a variety of subjects A versatile 24-70mm f/4 L-series lens with macro mode for up to 0.7x magnification. Ultrasonic AF provides fast, near-silent focusing.
The Canon RF 70-200mm F4 L IS USM is a compact zoom with quick focus and exquisite optics. It makes the lens as small as a typical 24-70mm when retracted, about 4.7 by 3.3 inches (HD
The most cost effective way is getting the kit with the RF 24-105L f/4 IS. It is competent in most things but is not the best at anything. The same could be said of the RF 24-70L f/2.8 IS, but you trade a bit of focal length range and a significant amount of money for that one stop.
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canon ef 24 70mm f 4 l is usm
