5D Mk 111 question

So reading a bit about the mk111 and I saw something about the auto focus and using teleconverters, not being useable past F 8.
Anybody have anymore info on this???

This is only the case when the converter (either the 1.4x or 2x) adds one or two stops and the maximum aperature and it ends up greater than f8
It will still focus past f8 just not if the lens converter combo limits the maximum aperature smaller than f8. I believe it is possible to tape over the contacts to retain AF but not sure about that.

And thats not just the 5D3, its any DLSR that isn't a 1D series body - I believe

My 5D Mark III can't meter beyond f/8. You'd think that 108 generations later Canon would have improved that.

Great Camera.....Dumb move on Canons part.

Hopefully enough people will write to canon and do a little Bing & Cing and Canon will pull theirs heads out and get a firmware update.

Christina.DazzleByDesi​gn wrote in post #14872620
And thats not just the 5D3, its any DLSR that isn't a 1D series body - I believe

same with 1dx. 1dmk4 is the last body with AF at f8.

bobbyz wrote in post #14872751
same with 1dx. 1dmk4 is the last body with AF at f8.

oh really? I didn't know that.. Why wouldn't they do it for their "flagship" camera?

Silverstonev8 wrote in post #14872376
This is only the case when the converter (either the 1.4x or 2x) adds one or two stops and the maximum aperature and it ends up greater than f8
It will still focus past f8 just not if the lens converter combo limits the maximum aperature smaller than f8. I believe it is possible to tape over the contacts to retain AF but not sure about that.

Don't you mean "smaller than f/5.6"? It won't AF at f/8, at least not according to Canon specs.

Expecting it to AF correctly - beyond f/5.6 for any non 1D series- is, well, expecting too much- you are pushing it beyond specs. Tape trick works - SOMETIMES- and won't necessarily be a fast autofocus- not for fast action. Tape trick = YMMV or should it be YMWV ! You can focus beyond 5.6 with a TC- albeit slowly- using Liveview and either manual focus at 10x or sometimes autofocus by itself.. Different lenses with different TC's will end up with different truth tables- a definite case of Your Mileage Will Vary !.
I can understand Canon dropping support for f/8 !.. It sells more longer lenses for them rather than TC's. Selling someone two lenses might net them an extra several thousand dollars. .. Selling one long lens with a TC- only adds about $500 to their bottom line [for the TC].. Solution: drop support for f/8- make users buy longer lenses! It's a business decision.

Echo Johnson wrote in post #14872674
My 5D Mark III can't meter beyond f/8. You'd think that 108 generations later Canon would have improved that.

funny. I guess that I am 109 generations behind. If, I ever get a canon body that does not work w/ f/8.0, I will have to do my best w/ my 400mm f/5.6.

Christina.DazzleByDesi​gn wrote in post #14872764
oh really? I didn't know that.. Why wouldn't they do it for their "flagship" camera?

Maybe because as they increase the resolution of the sensor, they need the focus system to be even more exact. After all, DoF isn't something absolute but is a question of what distance range that is "sharp enough".

My guess is that Canon have realized that the best they can do isn't good enough to match the assumptions of the customers, when used at f/8.

By the way mark three is written as a roman number, so it's the character I that is repeated three times. When switching to arabic digits, it will obviously have to be the single digit 3 - 111 would be a mark one-hundred-and-eleven. That is way out into the future.