Compact and lightweight
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Compact and lightweight

The 600mm F11 IS STM weighs less than a kilo (930 g / 2.05 lbs), features a perfectly reasonable 82mm filter thread and measures only 200mm (7.9 in) when stowed. Considering its focal length, these figures are impressive. The DO optical technology certainly helps, but the main reason for its unusual compactness is an innovative retractable design.