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Products are build for a price point, they know that if they up the price there will be fewer buyers+1It does not matter whether you want a fast car, a fast computer, a fast lens, a fast camera or a fast women; Its going to cost you The D400 thread proves their is an interest in a Hot hatch DSLR but there will always a limit to how much even keenest amateur photographers, will pay for a few more fpsThe well heeled are already catered for with the D4s and the Bugatti Veyron
I shoot my D800 with the grip all the time. Realistically, I don't get 6fps. 4-5 at the max.
The MB-D12 supports the Rechargeable Li-ion Batteries EN-EL15 and EN-EL18, common AA batteries, and the AC Adapter EH-5a/b (with Power Connector EP-5B). When the MB-D12 is mounted on the D800, high-speed continuous shooting at approximately 6 fps* using the DX-format image area is possible. The MB-D12 also offers the added convenience of controls, including shutter-release button, AF-ON button and multi-selector, for vertical shooting. What's more, the same seals as those used for the D800 with its magnesium body offer superior resistance to dust and water.*When powered by the AC adapter, or AA batteries or Rechargeable Li-ion Battery EN-EL18 with the MB-D12. Measured according to CIPA guidelines.
Processor: They can only process so many MB per second. D4 was 10fps but 11fps with AF locked. 16mb x 11 = 176mb/s. D800 is 6fps (with grip) x 36 = 216mb. My experience with the D800 is that the file sizes are rarely above 30mb. Using that you get 180mb/s or just about the same as the max of the D4. So with everything, the processor can probably only handle 170-190 mb of image data per second. My guess it is the good ole computer multiple value of 192.
File sizes from the compression does make a huge difference in the FPS. Jpeg is the fastest, 12bit, is slower, 14bit a bit slower yet, and if it is uncompressed, it is slower yet. Shooting Tiff files, basically kiss any sort of FPS goodbye.
Expeed 4 is rated for 12fps with 24mp sensor, so it should be able to do 8fps with 36mp. If they go to 40mp, you get 7fps, and if 50mp, you get 5.75.
ads Let's get back on topic. Good ideaGiven that the price difference between the second value of my D800 vs the price of a new D800s is likely to be similar to the cost of a new D7100 I think I am more likely to buy a D7100 as a second camera Good idea buying the D7100 for a second DSLR body. You will not regret it.