(Relatively) compact
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(Relatively) compact

The 100-500mm is relatively compact when zoomed 'out' to 100mm (207.6mm / 8.2 in) but extends (to 297mm / 11.7 in) at 500mm. A torque adjustment allows you to make the zoom movement stiffer or looser as desired, and lock the zoom ring if required.

Canon is at pains to reassure users that despite its telescoping design, this lens is very well-sealed against dust and moisture. At 1370 g (3 lbs), the 100-500mm is far from a lightweight lens, but it's only a couple of hundred grams heavier than the much faster RF 70-200mm F2.8L IS USM. The front filter thread is a very reasonable 77mm.

A removable tripod collar allows the lens to be mounted directly onto a tripod, in situations where hand-holding isn't desirable or practical.