see also:

• Olympus Four Thirds dSLR system
• Four Thirds lenses
• super wide angle lenses
• Olympus website product info

• a much loved wide angle zoom for Olympus Four Thirds dSLR system, particularly optimised for event photography, but the newer Olympus ZD 12-60mm f/2.8-4.0 SWD zoom lens has largely replaced it given its longer zoom range.
• practically diffraction-limited optics with some CA but better than Canon 24-70mm L lens

• 11-22mm = 22-44mm field of view in 35mm terms
• f/2.8-3.5 to f/22
• 12 Elements in 10 Groups, including 2 Aspherical Lens Elements
• close focus 0.28m = 0.13x macro
• internal focusing but not CDAF optimised and not SWD AF motor
• splash proof
• difficult to remove lens cap when lens hood in place
• Cokin P filters are just big enough to work
• 7 circular blades
• 72mm filter
• 75 x 92.5mm (lens extends by 10mm when zoomed to 11mm)
• 485g
• compatible with teleconverter but not extension tubes
• $799

• Wrotniak
• SLRGear.com
• ePhotozine review
  • 0.34% barrel distortion increasing to 2.64% at 11mm
  • no CA visible to the eye
  • edge-to-edge optically best 16mm at f/5.6, worst at 11mm
  • center is sharp wide open, but a touch better ar f/4