see also:

• Olympus Four Thirds dSLR system
• Four Thirds lenses
• super telephoto lenses
• Olympus website product info

• Super High Grade (SHG) Olympus Four Thirds dSLR system lens
• this is a unique super telephoto zoom lens covering 180-500mm field of view with a bight f/2.8 constant aperture
• a fantastic lens for action or wildlife photography and unique at 180-500mm equiv. f/2.8 but ~$US6000 or $A10,000 and 3.27kg with 105mm filter
• the longest zoom made by Canon is their 100-400mm f/4.5-5.6L IS which weighs 1.36kg but 2 stops slower.
• Canon make a 400mm f/2.8L IS lens but this is 5.3kg while the 500mm f/4L IS is 3.9kg and 1 stop slower.

• 90-250mm focal length = 180-500mm field of view on 35mm cameras
• f/2.8-f/22
• 17 Elements in 12 Groups, including 3 ED lenses
• weatherproofed
• close focus 2.5m = 0.08x macro
• 105mm filter
• 124 x 276 mm
• 3,270g
• compatible with extension tubes and teleconverters
• $5999

• SLRgear.com review
• efotografijia.si
• user review
• FourThirdsPhoto magazine (pdf)
• ePhotozine review
  • colour reproduction, contrast and the control; of chromatic aberrations on this lens are all excellent, as is the control of distortions
  • some question about slowish AF speed but then he was testing it with an Olympus E-500 dSLR