Two-minute reviewLet’s start with the size of what is a relatively small lens. Packed away, the RF 100-400mm F5.6-8 IS USM measures just 6.5 inches / 165mm from end to end, with a diameter of 3.15 inches / 80mm. It’s also impressively light – just 1.4 lbs / 635g. The RF 100-400mm lens doesn’t come with a hood, but those who want to cut down on non-image-forming light like a flare – or simply have a bit of protection –
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