<p>My 32GB Delkin CF 700x work perfectly in D810 (also in D3, D4 and D800). I just shot a wedding this Saturday (using this card), and I consider D810 to be the best ever built digital SLR . Huge differences vs. D800..., excellent viewfinder, white balance, colours, dynamic range , lcd, low ISO perfect at 6400 ,no more read/write time lag on cards, consistent exposure and extremely low noise shutter .<br /> And Dan, it works even with all my old CF/SD cards... :-)</p><div></div>