Canon 300mm f/2.8 L IS USM II EF-Mount Lens {Gel}

Canon's 300mm f/2.8L IS II: the telephoto benchmark for working pros

At 300mm with a constant f/2.8 aperture, this lens sits at the intersection of speed and reach that sports and wildlife shooters have relied on for decades. The optical formula runs 17 elements in 13 groups, anchored by one fluorite element and two UD lenses. That combination keeps chromatic aberration tightly controlled even wide open, which matters when you're shooting a bird against a bright sky or a sprinter crossing a finish line. The 8-blade diaphragm produces clean circular out-of-focus areas at f/2.8, and minimum focus lands at 2.5 meters for a maximum magnification of 0.13x.

The USM autofocus motor is fast and near-silent, with full-time manual override so you can make fine corrections without switching modes. Internal focus means the barrel length stays fixed during focus pulls, and weather sealing throughout the metal construction keeps the lens operational in rain and dust. The rear drop-in filter system accepts 52mm filters without requiring large, expensive front elements. At 5.62 lbs, this is serious glass that earns its place on a monopod or tripod collar mount. The 2-stop image stabilization adds a meaningful margin when hand-holding at the 1/300s threshold.

Adapters bring this lens onto Sony E, Canon RF, Nikon Z, Fuji X, and L-Mount bodies, so it moves with you across system changes without losing the optical performance you paid for.

Who It's For

Sports photographers working sidelines or tracks get the f/2.8 aperture's shutter speed headroom in artificial light, plus fast USM tracking on unpredictable subjects. Wildlife photographers benefit from the fluorite and UD optics that hold contrast and color accuracy when shooting at range in variable light. Photojournalists covering outdoor assignments rely on the weather-sealed metal construction when conditions turn. Studio or field photographers already shooting Canon RF bodies can run this glass natively via the EF-RF adapter without autofocus penalty.

Key Features

• 300mm focal length with constant f/2.8 aperture for reach and speed
• 17 elements in 13 groups with 1 fluorite and 2 UD lenses
• 8-blade diaphragm produces clean circular bokeh at f/2.8
• Ultrasonic (USM) autofocus with full-time manual override
• 2-stop image stabilization supports hand-holding near 1/300s
• Internal focus maintains fixed barrel length on monopod
• Metal construction with weather sealing throughout
• Rear drop-in 52mm filter system avoids front element cost

FAQ

What optical formula controls chromatic aberration at f/2.8?

One fluorite element and two UD lenses in a 17-element, 13-group design keep color fringing minimal even at maximum aperture, critical when shooting birds against bright skies or fast action.

How does internal focus affect handling?

The barrel length stays fixed during focus pulls, so balance on a monopod or tripod collar doesn't shift, and you don't have to worry about lens extension revealing dust seals.

What's the practical hand-holding threshold with image stabilization?

Two stops of IS brings the effective shutter speed floor to around 1/300s, workable for most sports and wildlife shooting if you have solid technique.

Does the USM autofocus allow manual corrections without mode switching?

Yes, full-time manual override means you can fine-tune focus by rotating the focus ring while the AF is active, no menu diving required.

Why use rear drop-in filters instead of front threads?

52mm rear filters cost far less than 300mm front elements, and you avoid the bulk and weight of enormous glass up front.

What weather sealing protects the barrel in wet conditions?

Metal construction throughout with sealing throughout means it stays operational in rain and dust, though dust caps and lens cases are recommended for extended outdoor use.

How much does this lens weigh and what mounting options are available?

5.62 lbs with a tripod collar included; you can adapt it to Sony E, Canon RF, Nikon Z, Fuji X, and L-Mount bodies without losing optical performance.