Digital SLR viewfinder sizes are published by manufacturers at 50mm using the native sensor size. As many of the sensors used are different sizes this table shows what the magnification is equivalent to on a 35mm SLR. This also allows easy comparison with known cameras from the film days.

I have added some film cameras in the bottom of the table for comparison.

    Viewfinder Sensor size /mm Published viewfinder magnification FF equiv (H) FF equiv (V) sensor crop factor Viewfinder magnification at 50mm equivalent on 35mm film camera
35mm film sized sensor
Canon 5D 96% x.71 35.8x23.8 0.96 0.96 0.96 1.01 0.95
Canon EOS-1Ds II 100% x.7 35.8x23.8 0.7 0.70 0.70 1.01 0.70
1.3x crop sensor
Canon EOS-1D (II) x.72 28.7x19.1 0.72 0.58 0.58 1.25 0.57
APS-C, 4/3 sized sensors
Canon EOS 300D, 350D, 400D 95% x.8 mirror 22.7x15.1 0.8 0.50 0.50 1.60 0.50
Canon EOS 20D, 30D 95% x.9 22.5x15.0 0.9 0.57 0.57 1.60 0.56
Canon EOS D30, D60, 10D 95% x.88 22.7x15.1 0.88 0.56 0.56 1.59 0.55
Minolta Dynax 5D 95% x.83 23.5x15.7 0.83 0.54 0.55 1.53 0.54
Minolta Dynax 7D 90% x.9 23.5x15.7 0.9 0.59 0.59 1.53 0.59
Nikon D40, D40x 95% x.8 mirror 23.7x15.6 0.75 0.53 0.53 1.53 0.52
Nikon D50 95% x.75 mirror 23.7x15.6 0.75 0.49 0.49 1.53 0.49
Nikon D70, D70s 95% x.75 23.7x15.6 0.75 0.49 0.49 1.53 0.49
Nikon D100 95% x.8 23.7x15.6 0.8 0.53 0.52 1.53 0.52
Nikon D80, D200 95% x.94 23.6x15.8 0.95 0.62 0.62 1.53 0.62
Nikon D2X, D2Xs 100% x.86 23.7x15.7 0.86 0.56 0.57 1.53 0.56
Olympus E-500 95% x.9 mirror 17.3x13.0 0.9     2.08 0.43
Olympus E-510, E-400, E-410 95% x.92 17.3x13.0 0.92     2.08 0.44
Olympus E-300

94% x1 porro mirror

 17.3x13.0 1     2.08 0.48
Olympus E-330

95% x.93 porro mirror

 17.3x13.0 0.93     2.08 0.45
Olympus E-1 100% x.96 17.3x13.0 0.96     2.08 0.46
Pentax *ist DL, K100D 96% x0.85 mirror 23.5x15.7 0.82 0.54 0.54 1.53 0.54
Pentax *ist D, DS, K10D 95% x0.95 prism 23.5x15.7 0.95 0.62 0.63 1.53 0.62
Sigma SD9, SD10 97% x0.77 prism 20.7x13.8 0.77 0.45 0.45 1.74 0.44
Sigma SD14 97% x0.9 prism 20.7x13.8 0.9     1.74 0.52
Sony A100 95% x0.83 23.6x15.8 0.83 0.55 0.55 1.53 0.54
Film cameras for comparison
Canon Rebel T2 90% x.7 mirror           0.70
Canon Elan 7NE 92% x.7           0.70
Canon EOS 3 97% x.72           0.72
Minolta Dynax 60 90% x.7           0.70
Minolta Dynax 7 94% x.8           0.80
Pentax K1000 x.88           0.88
Pentax *ist 90% x.7           0.70
Pentax MZ-5n 92% x.8           0.80
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