A full frame sensor takes up a lot of space, but this is just the viewfinder. If it is a APS-C sensor (which it looks to be), then the viewfinder is not as large as the sensor on a full frame sensor camera. The 50D is APS-C and has nearly a 100% viewfinder (I think it is about 95%), and the comparable D300 offers a 100% viewfinder with no apparent difference in build size. The reason the D3x and 1Ds mk 3 have a much larger pentaprism area (the bump above the lens where the viewfinder is housed) is because the larger 35mm full frame sensor requires a larger viewfinder. A 100% viewfinder on a D300 and a 100% viewfinder on a D3x are a different size, but still cover 100% of the sensor coverage.
Viewfinders for APS-C cameras are much smaller than 35mm full-frame cameras like the D3x and 1Ds you mentioned. The Nikon D300s and the Pentax K-7 both offer 100% coverage viewfinders and they don't have the huge humps on top housing large pentaprisms like the Canon 1Ds mk.III or the Sony A900. Since the area that APS-C viewfinders cover is smaller, they can use a smaller pentamirror (or rarely a pentaprism) to achieve the same 100%. In actuality, they are covering only a bit over 50% of a full 35mm frame. See here for a handy comparison: http://www.dpreview.com/reviews/nikond5000/page5.asp (scroll down to Viewfinder size).
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100% coverage viewfinder ?? there is NO way, these information are false, a 100% viewfinder takes a LOT of space, look at the D3x or the 1ds
A full frame sensor takes up a lot of space, but this is just the viewfinder. If it is a APS-C sensor (which it looks to be), then the viewfinder is not as large as the sensor on a full frame sensor camera. The 50D is APS-C and has nearly a 100% viewfinder (I think it is about 95%), and the comparable D300 offers a 100% viewfinder with no apparent difference in build size. The reason the D3x and 1Ds mk 3 have a much larger pentaprism area (the bump above the lens where the viewfinder is housed) is because the larger 35mm full frame sensor requires a larger viewfinder. A 100% viewfinder on a D300 and a 100% viewfinder on a D3x are a different size, but still cover 100% of the sensor coverage.
Viewfinders for APS-C cameras are much smaller than 35mm full-frame cameras like the D3x and 1Ds you mentioned. The Nikon D300s and the Pentax K-7 both offer 100% coverage viewfinders and they don't have the huge humps on top housing large pentaprisms like the Canon 1Ds mk.III or the Sony A900. Since the area that APS-C viewfinders cover is smaller, they can use a smaller pentamirror (or rarely a pentaprism) to achieve the same 100%. In actuality, they are covering only a bit over 50% of a full 35mm frame. See here for a handy comparison: http://www.dpreview.com/reviews/nikond5000/page5.asp (scroll down to Viewfinder size).