The peculiar thing about the measurement of viewfinder magnification is that they use a "normal" 50mm lens for both FX and DX. You can quickly calculate that an FX screen is about 11.7% larger (linearly). But the DX crop area of an FX viewfinder is 25% smaller (linearly) than a DX screen. Or to put it another way, the DX viewfinder is 133% of the DX crop view in an FX camera.
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