Canon RF 100-300mm f/2.8 L IS USM Full-Frame Autofocus Lens for RF-Mount, White {112} with Tripod Foot

Canon RF 100-300mm f/2.8 L IS USM: constant aperture reach at 5.7 lbs.

A constant f/2.8 aperture across a 100-300mm zoom range has long been the domain of prime lenses and heavy rigs. Canon's RF 100-300mm f/2.8 L IS USM changes that calculus. At 2,590g, it was the lightest lens of its kind at launch, and the optical design behind that weight figure is no compromise: 23 elements in 18 groups, including one fluorite element and four UD glass elements, with Canon's Super Spectra Coating to control ghosting and flare across the full focal range.

The built-in image stabilization corrects up to 5.5 stops of camera shake on its own. Pair it with an IBIS-equipped EOS R body and coordinated IS pushes that to 6 stops, which makes handheld shooting at 300mm a genuine working method than a gamble. Autofocus runs through a dual Nano USM system with independently actuated motors, keeping tracking fast and balanced across the zoom range. The 9-blade circular aperture produces smooth out-of-focus rendering at wide apertures. For shooters who need even more reach, the RF 1.4x extender opens up 140-420mm at f/4, and the 2x extender reaches 200-600mm at f/5.6.

The control ring on the barrel adds direct access to aperture, shutter speed, or exposure compensation without touching the camera body. A focus preset button near the mount lets you lock in a specific distance and snap back to it instantly. Dust and weather sealing runs through the mount, switches, and rings, and the fluorine coating on the 112mm front element sheds water and oil without needing solvents. This is a working professional's lens built to stay on a body all day.

Who It's For

Photojournalists and sports photographers shooting indoors will get the most from the f/2.8 aperture at 300mm, where arena lighting is inconsistent and subject isolation matters. Wildlife photographers who need to stay mobile will appreciate the 5.7 lb weight relative to comparable fixed-aperture telephoto primes. Theater and performing arts shooters benefit from the focus preset system, which lets them lock focus on a known stage position and return to it instantly. Event photographers working in low light can lean on the 6-stop coordinated IS when paired with an IBIS body, keeping handheld shots clean at longer shutter speeds.

Key Features

• 100-300mm constant f/2.8 aperture across entire zoom range
• Dual Nano USM autofocus motors independently actuated for fast tracking
• 5.5-stop image stabilization, 6 stops with EOS R IBIS
• 23 elements in 18 groups with fluorite and four UD glass elements
• 9-blade circular aperture for smooth bokeh
• Dust and weather-sealed with fluorine front coating
• Compatible with RF 1.4x and 2x extenders for extended reach
• Control ring on barrel for direct aperture and exposure adjustment

FAQ

Can I use this lens for handheld shooting at 300mm?

Yes. The built-in IS corrects up to 5.5 stops of shake on its own, and pairs with EOS R body IBIS for up to 6 stops total, making 300mm handheld work genuinely reliable rather than a workaround.

How does this lens stay so light at f/2.8 across 100-300mm?

It uses fluorite and four UD glass elements with optimized group geometry in 18 groups. At 2,590g (5.7 lbs), it was the lightest f/2.8 300mm zoom at launch-no exotic materials needed, just disciplined optical design.

What extenders are compatible, and how do they affect the aperture?

The RF 1.4x extends it to 140-420mm at f/4, and the RF 2x reaches 200-600mm at f/5.6. You can swap them on and off to preserve the f/2.8 speed when you need low-light performance.

Does the autofocus keep up during tracking?

The dual Nano USM motors are independently actuated, which keeps focus fast and balanced across the zoom range while tracking moving subjects like sports action.

How does the control ring work?

It sits on the barrel near the front and lets you adjust aperture, shutter speed, or exposure compensation directly from the lens without touching the camera body-effectively adds a third dial to the EOS R.

Is this lens sealed against weather?

Yes. Dust and weather sealing runs through the mount, switches, and rings. The 112mm front element has fluorine coating that sheds water and oil without needing solvents.

What's the minimum focusing distance?

5.9 feet (1.8 meters) across the zoom range, which is reasonable for a 300mm telephoto and doesn't force you to step back excessively for closer subjects.