Originally Posted by
neuroanatomist
7D - 1.0x, 100%, 22x15mm = a VF 'window' of ~22x15mm (330 mm^2)
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1DIV - 0.76x, 100%, 28x19mm =a VF 'window' of ~21x14mm (294 mm^2)
5DII - 0.71x, 98%, 36x24mm =a VF 'window' of ~25x17mm (425 mm^2)
also, for comparison:
40D - 0.95x, 95%,22x15mm = a VF 'window' of ~20x13.5mm (270 mm^2)
Rebel G (35mm) -0.70x, 90%, 36x24mm =a VF 'window' of ~23x15mm (345 mm^2)
So, from those measurements, the 7D and 1DIV will be similar, while the 5DII's VF will be substantially larger. The 40D is the smallest of the bunch, and the film Rebel slots in between the 7D/1DIV and the 5DII. If you thought the film Rebel was a big change from your 40D, the 7D/1DIV will be a little bigger than your 40D, but the 5DII will be comparatively huge (57% larger area than your 40D VF).