Canon RF 600mm F/11 IS STM

This Canon prime puts 600mm of reach into a short, light barrel for RF-mount full-frame cameras. It suits photographing distant birds, wild animals and outdoor sport. It also works for the moon and air shows, where you cannot move closer.

It weighs 2 lb 0.8 oz (930 g), light for this focal length, so handheld shooting is realistic for a whole outing. Canon launched it in 2020 and it is still in production.

The trade-off is the fixed F/11 aperture. It keeps the size down, but you will need good light or higher ISO settings for fast shutter speeds. Optics and Features cover what that means in practice.

The lens measures 10.61 in (269.5 mm) long and 3.66 in (93 mm) wide, and it weighs 2 lb 0.8 oz (930 g). Those are compact figures for a 600mm prime. The front accepts screw-in 82mm filters, so any polariser or ND filter you buy needs a matching 82mm thread.

At 600mm on a full-frame camera, distant subjects fill the frame. A wader on a far mudbank, a striker at the far touchline or a perched hawk all arrive large without cropping.

The F/11 aperture is the working limit. In strong daylight it is fine, and the single aperture keeps settings simple. In woodland or evening light, you must raise ISO to hold shutter speeds fast enough for a moving animal. Fast action in poor light is not this lens's home.

Depth of field at 600mm stays shallow even at F/11, so accurate focus matters. Backgrounds will blur, though less strongly than a fast telephoto would at this distance.

Closest focus is 14.8 ft (450 cm). That is near enough for garden birds and other approachable subjects at this focal length. Maximum magnification stands at 0.14x, so very small subjects stay small in the frame. Our Optics score for this lens is 51 of 100.

Image stabilization is built in. At 600mm, tiny camera movements show up as blur, and the stabilizer helps reduce that shake for handheld shots. It also steadies the viewfinder image, which helps you place focus on a distant bird. The stabilizer steadies the camera, not a moving subject. A tripod removes the need, but the light weight favours walking with it handheld.

There is no weather sealing. Wildlife and sport often mean dust, sand or sudden showers, so use a rain cover and wipe the lens down after exposure. In dry, calm weather the omission matters little.

The glass has no fluorine coating, so clean dust and fingerprints off it the ordinary way, with a blower and a soft cloth. Our Features score for this lens is 45 of 100.

The optical design has 10 elements in 7 groups. Two of those elements are intended to help reduce chromatic aberration. That is the colour fringing at high-contrast edges, such as a bird against a pale sky. Our Construction score for this lens is 15 of 100.