In addition to an anti-reflection multi-coating, the front and rear elements of all newly announced EF lenses and extenders are treated with Canon's new fluorine anti-smear lens coating. The fluorine layer is highly oil- and water-repellent so that any oil smears or water droplets on the lens can be wiped off quickly and easily without the aid of solvents using a soft dry cloth. These four new lenses and two new extenders are the first of their type to employ fluorine coating, and it is expected that this new feature will enhance the usability of the lenses during adverse shooting conditions.
The new Series II EF super-telephoto lenses can correct camera shake up to four full shutter speed steps, compared to two shutter speed steps for the original versions. This improvement is made possible by a new low-friction stabilizer mechanism that is not only more efficient than the previous design but also smaller and lighter. Other enhancements to the IS systems of both new super telephoto lenses have enabled quieter operation ideal for use during video capture.
Providing professional sports and wildlife photographers with greater tracking flexibility, Canon has introduced a third Image Stabilization mode option to its new EF 300mm f/2.8L IS II USM and EF 400mm f/2.8L IS II USM lenses. When mode 3 is selected on the lens, the image stabilization effect will not be seen in the viewfinder. When the shutter button is pressed halfway, the lens will begin detecting camera or lens movement and only during exposure, when the shutter is fully depressed, will the Image Stabilization engage and provide the equivalent of four stops faster compensation for blur-free images. The new Mode 3 is particularly useful when a photographer does not want to see the IS working in the viewfinder while tracking a moving subject.
Helping moviemakers achieve smoother and more appealing focus shifts when filming on EOS DSLR cameras, Canon has included a new Power Focus (PF) mode on the Company's two new super telephoto lenses. This mode allows manual rack focusing to be operated smoothly by turning a playback ring that is normally used for the focus preset function. Both low-speed and high-speed focus shifting are available.
Additionally, a new security slot attachment has been included on both new super-telephoto lenses to allow a wire-type security lock to be easily affixed, a great safety feature for professionals shooting from high vantage points above arenas and crowds.