The APS-C format DSLRs cannot be directly compared here because the specification of viewfinder magnification is in terms of a 50mm lens, but to get the same field of view as a 50mm lens on full frame, one has to use a 35mm lens on the APS-C DSLR. The effective viewfinder magnification of an APS-C DSLR is therefore lower than the specified one. Rough testing leads me to believe that the D300, for instance, which is specified as 0.94% magnification using 50mm, only provides an effective magnification of .75% when using a 35mm lens. This is not bad when compared to D3, but the Nikon FM2N is better for manual focussing.
|Camera||Viewfinder magnification using 50mm at infinity||Viewfinder Coverage||Eyepoint|