Canon's breakthrough multi-layer diffractive optical lens technology provides photographers with superior super-telephoto performance in a smaller and lighter design with enhanced correction for chromatic aberrations. We've also added our highly effective Image Stabilization system that gives the equivalent effect of a shutter speed two stops faster. And, it's built to our professional standards with fast AF, full-time mechanical focus and dust and water-resistant construction.
Focal Length & Maximum Aperture - 400mm 1:4Lens Construction - 17 elements in 13 groupsDiagonal Angle of View - 6 Degrees 10'Focus Adjustment - Inner focusing system with USMClosest Focusing Distance - 3.5m / 11.5 ft.Filter Size - 52mm Drop-InMax. Diameter x Length, Weight - 5.0" x 9.2", 4.3 lbs. / 128.0 x 232.7mm, 1940g