Tessera Develops 3MP Wafer Level Optics with EDOF

Yahoo: Tessera announced it is developing one of the industry’s first 3MP wafer-level optics solutions that integrates extended depth of field (EDOF). Sampling of Tessera’s integrated 3MPix wafer-level optics technology is expected to start in Q4 2009.

I wonder if the EDOF is mainly needed to cover optics assembly tolerances, or there is enough enhancement to provide extended focus even after the misalignments take their toll.