According to Nikon, the D800 and D800E use different designs of of filters over the sensor. See the Functions of Nikon D800/D800E optical low-pass filter, which is described below.
With the D800, light passing through the lens that is separated in four segments using a low-pass filter is received by the image sensor. Because separation pitch of the low-pass filter is much shorter than that of the image sensor, moiré and false color reduction can be achieved with minimal deterioration of resolution.
With the D800E, the effects of the low-pass filter is removed, and the light is received by the image sensor at a single point, achieving higher-resolution images with minimal blur.
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