Focal Length & Maximum Aperture: 400mm 1:2.8Lens Construction: 16 elements in 12 groups (Including drop-in rear filter, Fluorite: G2 and G4, UD Lens: None)Diagonal Angle of View: 6.10 degreeFocus Adjustment: Inner focusing system, with focusing camClosest Focusing Distance: 2.7m / 8.86 ft.Filter Size: 52mm Drop-InMax. Diameter x Length: 163.0 x 343.0 mmWeight: 3850 g
