Surface area: 337.50 mm². vs. 864.00 mm². Difference: 526.5 mm² (156%) 5D Mark III sensor is approx. 2.56x bigger than 80D sensor. Note: You are comparing cameras of different generations. There is a 4 year gap between Canon 80D (2016) and Canon 5D Mark III (2012). All things being equal, newer sensor generations generally outperform the older.
Canon's EOS 5D Mark III has a lot to live up to. For a start, the original Canon EOS 5D was the first DSLR to really bring full-frame digital photography within the reach of enthusiast photographers.
Canon 7D Mark II specifications: Your purchases support this site. Body Only. Body Only; Body with W-E1 Wi-Fi Adapter; Kit with 18-135mm Lens; Like Canon introduced on the 5D Mark III, the new
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canon 5d mark iii specifications