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Live Q&A with Nikon reveals D4 video shortcomings @ EosHD

"The downsampling of the sensor is similar to the Nikon J1, a $499 mirrorless camera. According to Nikon, “subsampling is only along each horizontal video line; there’s no sub-sampling between video lines. ” Frankly this is bloody ridiculous. I’ve seen the results of this on the J1 and it

isn’t pretty – sheering on fine diagonal patterns and very soft detail. I expect better from a pro DSLR. With that in mind don’t expect resolution on the D4 to beat the GH2 or Canon 1DX with DIGIC 5.

A worse battery. Apparently regulation changes in Japan have forced a maximum capacity to batteries less than once allowed so the D4 has significantly less battery life than previous models. Expeed 3 is also far more power hungry."