Olympus 90-250mm f/2.8 Zuiko Lens for E Series DSLR Camera Construction: 17 elements in 12 groups (Including 3 ED Lenses) Number of Blades: 9 Angle of view: 14 to 5 F stop range: Maximum Aperture: f2.8 Minimum Aperture: f22 Closest Focusing Distance: 8.2" (2.5m) Maximum Magnification: 0.08x(0.16x 35mm equivalent)