Along with the new Olympus OM-D E-M1 camera to be announced on September 10-11, there is a new lens Olympus 12-40mm f/2.8 lens will also be announced.
This is a high quality lens which is said better than Panasonic 12-35mm f/2.8 X lens, so the price could be expensive than this lens.
12-40mm with constant f/2.8 aperture (Source: Egami).
39.081mm – f = 12.249 focal length
30.85 ° – 2ω = 85.27 angle
BF 16.194 – 16.192mm
131.16mm – 140.24 Length
13 images in 11 groups lens configuration
5 three aspherical surface
3 ED glass sheets