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​Here are the specifications for the Canon RF100-400mm F5.6-8 IS USM:

​Key Features:

• ​Focal Length: 100-400mm (telephoto zoom)

• ​Maximum Aperture: Variable, from f/5.6 at 100mm to f/8 at 400mm.

• ​Lens Mount: Canon RF (for full-frame mirrorless cameras like the EOS R series)

• ​Image Stabilization: Up to 5.5 stops of shake correction.

• ​Autofocus: Nano USM (Ultrasonic Motor) for fast, smooth, and quiet autofocus.

• ​Optical Construction: 12 elements in 9 groups, including one UD-glass element and one aspherical element.

• ​Filter Size: 67mm (front filter thread)

• ​Weight: 1.4 lb / 635g (lightweight for its class)

• ​Minimum Focusing Distance: Varies from 2.9 feet (0.88m) at 200mm to 3.94 feet (1.2m) at 100mm.

• ​Maximum Magnification: 0.41x, which allows for some close-up shooting.

• ​Compatibility: This is Canon's first non-L-series telephoto lens to be compatible with the RF 1.4x and 2x teleconverters.