Canon RF 100-500mm F/4.5-7.1L IS USM

This Canon super-telephoto zoom covers 100–500mm on full-frame RF-mount cameras. Introduced in 2020, it suits wildlife and outdoor sport. Its broad telephoto range helps when a subject moves toward or away from your position.

The main trade-off is light gathering at full reach. The maximum aperture narrows as you zoom, which matters in dim conditions. The shorter settings help when an animal approaches your position or when you want to show more of its surroundings.

The lens weighs 3 lb 0.1 oz (1365 g) without its tripod mount. It measures 8.17 in (207.6 mm) long and 3.69 in (93.8 mm) across. It is substantial to carry, and support helps during long sessions. Screw-in filters must match the 77mm thread.

At 500mm, a distant bird or player takes up more of the frame than at the short end. Nearby subjects can stand apart from a distant background, though the amount of blur depends on the distances involved. Look beyond the subject for distracting bright patches or lines.

When action moves closer or becomes difficult to track, zooming out gives you a wider view. You can find a bird against the sky at a shorter setting, then tighten the framing as its path becomes easier to follow. The zoom ring lets you make that change without moving position.

The maximum aperture narrows from f/4.5 to f/7.1 as you zoom in. At 500mm, shade and early-morning light can require a higher ISO to maintain enough shutter speed. A moving subject needs more speed than a still one. Bright conditions give you more room to balance these choices.

Closest focus is 3 ft (90 cm) at 100mm, measured from the sensor. It becomes longer at 500mm, where magnification reaches 0.33x. These are different operating points. The long end can frame a small subject at a pond edge while leaving more space in front of the glass.

The optical stabilizer provides five stops of camera-shake correction. It helps with handheld framing and still subjects at slower shutter speeds. At full reach, firm support remains useful during long waits in a hide. Use enough shutter speed when birds or players move.

Weather sealing helps resist dust and moisture outdoors. Use cover in persistent rain. Fluorine coating helps water and oily marks wipe away from the glass during field cleaning.

An adjustment ring changes how firmly the zoom ring turns, from smooth to tight. You can choose more resistance for carrying or less for quick framing changes. It controls friction rather than providing a lock at each focal length. The features specification score is 97 out of 100.

Six UD elements and one Super UD element help reduce chromatic aberration. This fault occurs when colours focus at different points and leave fringes along high-contrast edges. Backlit feathers or a dark animal against a bright shoreline can make those fringes visible.