Canon RF 600mm f/11 IS STM 
​Key Features:
​Focal Length: 600mm (Fixed) 
​Aperture: Fixed at f/11. The lens has no aperture blades. 
​Image Stabilization: Up to 5 stops of shake correction, making handheld shooting more feasible. 
​Autofocus: STM (Stepping Motor) for quiet and smooth autofocus, suitable for both stills and video. 
​Construction: 10 elements in 7 groups, utilizing Gapless Dual-Layer Diffractive Optics (DO) to reduce chromatic aberration and allow for a more compact design. 
​Lens Barrel: Retractable, with a locking mechanism for a more compact size when stored. 
​Filter Size: 82mm 
​Minimum Focus Distance: Approximately 14.76 ft (4.5 m) 
​Weight: Approximately 2.05 lb (930 g) 
​Dimensions (Diameter x Length): Approximately 3.66 x 10.61" (93 x 269.5 mm) in the extended shooting position. It is shorter when retracted. 
​Compatibility: Designed for Canon's RF-mount mirrorless cameras. It can be used with Canon's RF 1.4x and 2x extenders to increase the focal length to 840mm (at f/16) and 1200mm (at f/22), respectively.