Let’s take a look at effective ISO ~1100 when downsampled. Here are three other camera resolutions, width in pixels:
- Nikon D800: 7360
- Nikon D3x: 6048 = 82.2% linearly
- Canon 5D Mark III: 5760 = 78.2% linearly
- Nikon D3s: 4256 = 57.8% linearly
Never look at actual pixels quality without considering the context, e.g., the total number of pixels.
A higher sampling frequency is always better, everything else being commensurate; this can reduce digital artifacts by sampling at a higher frequency, then downsampling to an output resolution. This is why the future holds in store a ~100+ megapixel DSLR as a great way to produce 50 megapixel images.
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