That's not the case: different headsets have different fields of view, and most, including the DK2, have a FOV that's considerably narrower than the Sensics dSi

That's not the case: different headsets have different fields of view, and most, including the DK2, have a FOV that's considerably narrower than the Sensics dSight's. Likely the dSight doesn't cover the full range of eye movement either. https://docs.google.com/spreadsheet/ccc?key=0ApTBEPEA_odkdHp5Y2d5a3R4NkZOTUlNWENDd3VHTWc&usp=sharing#gid=0 https://docs.google.com/spreadsheet/ccc?key=0ApTBEPEA_odkdHp...