Specifications:

Brand Canon
Focal Length 100 to 300mm
Maximum Aperture f/2.8
Minimum Aperture f/22
Lens Mount Canon RF
Lens Format Coverage Full-Frame
Angle of View 24° to 8° 15′
Minimum Focus Distance 5.9′ / 1.8 m
Maximum Magnification 0.06 to 0.16x
Optical Design 23 Elements in 18 Groups
Diaphragm Blades 9, Rounded
Focus Type Autofocus
Image Stabilization Yes
Tripod Collar Fixed and Rotating
Filter Size 112 mm (Front)
Dimensions (ø x L) 5 x 12.7″ / 128 x 323.4 mm
Weight 5.7 lb / 2590 g

Features:

The 100-300mm zoom design offers more versatility for tracking moving subjects, recording candid moments from a distance, and backing off from scenes a bit for a wider frame for more context.

Despite switching to a zoom design, this lens retains the a bright and constant f/2.8 maximum aperture that excels in available lighting conditions and helps to achieve a shallow depth of field to isolate subjects against a blurred background.

Wholly new optical design includes fluorite elements and ultra-low dispersion glass, plus one aspherical element, to achieve a higher degree of clarity and sharpness with virtually no distortion.

Canon’s Air Sphere Coating (ASC) and Super Spectra Coating (SSC) minimizes ghosting and flare to better enable working in backlit conditions or when facing strong lighting situations.

Dual Nano USM system uses both a ring type USM and an STM mechanism to realize quick and accurate focusing.

Two separate focusing groups are independently actuated for greater maintained sharpness throughout the zoom range and at different focus positions.

Focus range limiter can be set to the full focusing range, from 5.9′ to infinity, or from a 19.7′ to infinity range for quicker performance if working exclusively with distant subjects.