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| p.4 #5 · Limited evidence mystery camera (5DX) is 30MP+ |
The method works well if the data's good enough, skibum5. I verified it by taking a photo of my Nikon D700.
Here's the whole shot. I tried to roughly replicate the angle of the spy shot, but my longest lens is 180 mm so I wasn't able to get everything identical.
Here's a straightened 100% crop of this photo, to compare with Ciprian's version on page 1 of this thread.
I've zoomed in to 100% on a photo in playback mode on the D700. (This lady's backlit hair was amazing, by the way.) By my reckoning, the yellow and grey boxes have widths of 44 and 298 pixels, respectively. The D700 has an LCD with 640 pixels across. Therefore, the long side of its photos should be (298/44)*640 = 4335 pixels long. In fact, the Nikon D700 takes photos of 4256 x 2832 pixels, so very close to the predicted size.
With Canon cameras, the calculation is complicated by their 10x maximum zoom ratio. The 10x figure seems to apply across the entire range of Canon SLRs, regardless of the sensor or LCD resolution of the camera. Despite this, owners seems to think their cameras zoom to 100%, probably because they haven't read the manual! I'd guess the "5D Mark III" will also zoom to 10x, not 100%.