Focal length: 300mm
Maximum aperture: f/2.8
Lens construction: 17 elements in 13 groups
Diagonal angle of view: 8 degrees at 15 feet
Focus adjustment: Inner focusing system with USM
Closest focusing distance: 8.2 feet
Filter size: 52mm drop-in
Dimensions: 5 inches in diameter and 9.9 inches long
Weight: 90 ounces