5D mk3 and 6D auto focus differences while filming??

OK. But then consider what it is you want to accomplish. If it's better AF during video recording, then you're heading the wrong way. At least right now.

My main focus is photography "BUT" its great to do videoing as well..

I see. Well, then it's like what has already been established in this thread - currently there's no full frame model with the Dual pixel AF system you get in the 70D. Maybe one will show up in the future, should dual pixel AF strike as being a selling feature.

Meanwhile I presume you already know the advantages and disadvantages of FF vs. APS-C.

From my experience there is very little difference between FF and crop sensor cameras when it comes to video. The big advantage of FF where video is concerned is the wider FOV with lenses and the slightly shallower DOF, the noise advantage is much less obvious in video than it is for stills imo.

I would look into a follow focus rig for your current 60D and see how you like it, if you really can't get used to manually focusing then your best bet is to get a 70D.

As for Kins2on's comment on the 6D vs. 5DIII, I agree about the moire issue, but from what I've seen online the 6D video is actually sharper than the 5DIII, though the difference is minimal.

EverydayGetaway wrote in post #16341418
From my experience there is very little difference between FF and crop sensor cameras when it comes to video. The big advantage of FF where video is concerned is the wider FOV with lenses and the slightly shallower DOF, the noise advantage is much less obvious in video than it is for stills imo.

I would look into a follow focus rig for your current 60D and see how you like it, if you really can't get used to manually focusing then your best bet is to get a 70D.

As for Kins2on's comment on the 6D vs. 5DIII, I agree about the moire issue, but from what I've seen online the 6D video is actually sharper than the 5DIII, though the difference is minimal.

Using a 60D I think ISO 800 is probably the MAX you want to go for usable video. On a MK III you can hit 3200 and still be usable. At least in my experience...

scotchtape wrote in post #16341565
Using a 60D I think ISO 800 is probably the MAX you want to go for usable video. On a MK III you can hit 3200 and still be usable. At least in my experience...

On the 60D I'd agree, I'm talking with the newer crop cameras. The video on my EOS M and on my 6D is very similar, even at ISO3200. It isn't until you get at or above ISO6400 that you really see much difference, and at that point, honestly you should have better lighting anyway if you're doing video... but I usually shoot video in controlled lighting, not run-and gun shooting (though I should try that some more, I do enjoy watching videos like that from other people).