Key features

• L-type telephoto lens
• Four-stop Image Stabilizer for blur-free shots
• Three IS Modes
• Power Focus mode
• Fluorine lens coating
• Two fluorite lens elements reduce chromatic aberration and colour blurring
• Robust build with superb handling
• Close focusing distance of 2m (6.56ft)
• Ring-type USM with high-speed CPU for silent, high-speed AF
• Security cable lock attachment point
• Long and short tripod attachments plates provided

The 16 lens elements in 12 lens groups, as well as the use of two Fluorite lens elements, effectively minimises chromatic aberration and eliminates colour blurring around the edges of a subject – thus providing higher levels of resolution and contrast than the outgoing model.

The optical design and the placement lens elements as well as the use of a Sub-Wavelength structure Coating (SWC) on the fourth group of lens elements reduces ghosting and flare when a bright light source is included within the frame. 

The lens’ ring-type USM autofocus motor combines with an optimized AF algorithm to provide autofocus on par with the outgoing model. The new Power Focus mode is activated from the focus mode selector switch. This mode allows the lens to adjust the focus smoothly by driving the AF motor. It can be used when shooting movies with the lens to provide a pull focus effect.

Power Focus is activated by turning the Focus Preset ring. A small turn will drive the focus slowly, while a larger turn will provide a faster movement through the focus range.

In a concerted effort to improve the handling of the lens, the size and weight have been reduced and the focus ring and switches have been redesigned and repositioned. The weight reduction is 150g (down to 2400g) compared to the previous model and has been made possible by the use of Magnesium alloy and Titanium in the lens body construction.

The focus ring has been moved to fit in a more ergonomic position and it has been made wider so it is easier to find with your eye to the viewfinder.

The switch arrangement has also been modified. The switches are no less likely to be knocked accidentally, and they arrangement is such that the most commonly used switches are placed closer to the camera body, while those used less frequently are placed further away.

Improved durability is another area that has been addressed. The new lens features better dust and moisture proofing and a more durable Image Stabilization mechanism to ensure it keeps working in all environments.

Lenses like this are highly desirable and can be targeted by thieves. To help to limit the risk of theft, the tripod collar-locking knob features a security attachment point compatible with Kensington-type cable locks. By attaching a cable lock to the locking knob rather than the lens, the lens can still be rotated within the tripod collar without tying the lens up in the cable lock.

Designed with lens Extenders in mind, the EF300mm f/2.8L IS II USM lens functions perfectly with the Canon’s Mark III EF1.4x and EF2x Extenders to provide exceptionally high image quality. To get the best out of the new lens and the Mark III extenders you must ensure you attach the Extender to the lens first, before attaching the whole unit to the camera. This ensures that the combined lens information is transmitted correctly to provide the optimum image quality and focus performance.