




- A high-thrust HLA (High-response Linear Actuator) quickly moves the lightweight focusing group for quick focus switching and nimble tracking of fast-moving subjects.
- A new function ring can be configured to control one of two settings, depending on how its settings switch is set: in Focus Preset Mode, turning the ring will instantly shift focus to a pre-registered position. In Power Focus Mode, turning the ring allows for constant speed focus pulling (useful during video shooting) and the focus speed can be changed in two steps.
- Four separate AFL buttons make it easy to control focus position while tracking subjects.
- Focus Mode and Focus Limiter switches give further control on focus speed and range for even more control depending on what the subject is and how far away it is.


- Mode 1 is a general application stabilization mode, suitable for most photo and video situations.
- Mode 2 is a specialized setting for panning work and makes use of the OS2 algorithm to better stabilize shots while moving the lens horizontally, vertically, or diagonally, regardless of the camera's orientation.
- Magnesium alloy barrel for durability without excessive weight.
- Dust- and splash-resistant seals for reliability in inclement weather conditions.
- The front element features a water- and oil-repellant coating that is especially easy to clean.
- Thermal insulation paint prevents overheating in extreme temperatures.


- As a heavier and larger lens, this 300-600mm f/4 lens will often be used atop a tripod or monopod; it features a rotating tripod collar that incorporates detents at each 90° position. The removable tripod foot is also compatible with Arca-type clamps for direct attachment to a variety of heads.
- Compatible with 40.5mm filters via an included drop-in filter holder. Optional variable ND and circular polarizer drop-in filters can be used instead, too.
- A matching lens hood is included along with a custom backpack-style protective case, removable tripod socket, and the drop-in filter holder.