Focal Length: 28mm
Maximum Aperture: 1.8
Minimum aperture: 22
Lens Construction: 10 elements in 9 groups
Diagonal Angle of View: 75o
Focus Adjustment: Rear focusing system with USM
Closest Focusing Distance: 0.25m / 0.8 ft.
Filter Size: 58mm
Dimensions (D x L): 73.6mm x 55.6mm (2.9" x 2.2")
Weight: 310g (10.9 oz)