example,
Canon 7D: 329 sq.mm
Nikon D90: 336 sq.mm
Pentax K-7: 336 sq.mm
Nikon D300s: 351 sq.mm
Nikon D700: 589 sq.mm
Canon 5D mkII: 601 sq.mm
Canon 1Ds mkIII: 657 sq.mm
Pentax ME Super: 755 sq.mm
Pentax LX: 764 sq.mm (with FA-1 finder)
Olympus OM-1: 771 sq.mm
Pentax MX: 796 sq.mm
Canon 7D: 329 sq.mm
Nikon D90: 336 sq.mm
Pentax K-7: 336 sq.mm
Nikon D300s: 351 sq.mm
Nikon D700: 589 sq.mm
Canon 5D mkII: 601 sq.mm
Canon 1Ds mkIII: 657 sq.mm
Pentax ME Super: 755 sq.mm
Pentax LX: 764 sq.mm (with FA-1 finder)
Olympus OM-1: 771 sq.mm
Pentax MX: 796 sq.mm