« on: March 06, 2013, 04:20:21 PM »
I might also consider magic lantern and focus peaking once the software gets out of the early testing stage.
Um, my usual comment: On other than the 2012 cameras ml is stable and proven for years - though on 6d and the op's 5d3 you have indeed to wait for the official release.
I've used the current ML beta for 5D3 and it works pretty good for focus peaking. The downside is it's impossible to see it when shooting in daylight.
I've also used AF confirm chips for this. The only problem is if using an adapter, you need a chip that has programmable AFMA in it because the thickness of the adapter is greater than the AFMA span in the camera. Unfortunately I haven't found a AFMA programmable chip that works with 5D3. I've found some that work great with 5D2, 50D, etc., but not 5D3. The non-AFMA-programmable chips seem to work with 5D3 but that rules out using an adapter.