The Nikon F series cameras except may be the F and F2 are not 100% viewfinder accuracy either but I think they are better than 99%. So 97% is not considered to be virtually 100% as in Nikon manual tends to say. I have only owned F2, F3 and F5 and found the viewfinders are accurate but can't verify if they are actually 100%. I never own the Canon and thought that the F1 was 100% accurate. May be the Minolta XK is but then it has an electronically controlled shutter.