The 50mm matching human eye has more to do with viewfinder than anything else.

If you hold a 35mm SLR camera against one eye, and look with both eyes open, and adjust the focal length, the focal length (to the nearest 10) that comes closest to matching both eyes (or matching what you'd see with just a window held in front of your eye) is 50.

50mm in a 35mm SLR is not going to give the same magnification in a medium format camera, nor in a DX format DLSR.

Furthermore, the Poser 50mm is actually off by a factor of 1.4x versus a 35mm SLR camera. It's much closer to the DLSR DX format - though by accident, not design.

So - in Poser, you would choose 35mm to match the magnification of what you'd see in an un-magnified rectangular window held up in front of your eye.

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