That hmd has only a 40 degree field of view, as opposed to the rift's 100 degrees. FOV is normally diagonal, so for 800x600 we have 1000 "diagonal" pixels, and

That hmd has only a 40 degree field of view, as opposed to the rift's 100 degrees. FOV is normally diagonal, so for 800x600 we have 1000 "diagonal" pixels, and for the rift's 960x1080 (per eye) we have 1444 "diagonal" pixels. So that works out to: 1000/40 = 25.0 pixels per degree for the z800 1444/100 = 14.4 pixels per degree for the rift So the z800 would have almost 4 pixels for every 1 pixel of the Rift In fact, it's even less for the rift because the DK2 doesn't have a standard RGB display but pentile pixels, which means you only have the full 1920x1080 for the green subpixels, the red and blue are reduced since humans are less sensitive to those colours