When comparing Canon EOS 5D Mark III vs Canon 70D, the Slant community recommends Canon EOS 5D Mark III for most people. In the question“What are the best DSLRs that have a multiple exposure setting?” Canon EOS 5D Mark III is ranked 1st while Canon 70D is ranked 2nd. The most important reason people chose Canon EOS 5D Mark III is:
61-point autofocus system with 41 cross-type points that performs well in low light.
Specs
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Pros
Pro Good autofocus system
61-point autofocus system with 41 cross-type points that performs well in low light.
Pro Complete manual control for video
Shutter, aperture and ISO can be set manually for video.
Pro Excellent ergonomics
Pro Excellent build quality
Pro In Camera HDR
Pro External mic jack
Pro Weather sealed
Cons
Con The camera is showing its age
5D Mark III was released in 2012.
Con Dynamic range could be better
5D Mark III has 11.7 stops of dynamic range while competitors have around 14 stops. And shadow recovery is lacking as well limiting HDR photos further.
Con AF point coverage is restricting
Layout of AF points restricts to compose shots in a certain way.
Con Lacks continuous AF in movie mode
Con Lacks programmable Auto ISO
Con Can't set arbitrary exposure time
Con AF points don't illuminate in Servo mode
It can be difficult to see AF points in low light as they do not illuminate in Servo mode.