09-21-2014 03:44 AM
09-21-2014 09:30 AM
I haven't read it yet but the link here takes you to a PDF that should clear that up.
09-21-2014 12:42 PM
09-21-2014 05:45 PM
Thank you--very helpful and the literature you forwarded did confirm that the center cross type group of 5 will be able to AF to f8 with the use of extenders. Most likely it'll be much slower than f5.6, but it'll still be available which is a plus.
I did send in the exact same technical question to Canon Support--this was their response "Since the camera was only just announced and is not available yet, we do not have any specific information about the sensitivity of the AF system with extenders attached. Most of our cameras are sensitive to f/8, so there is a strong possibility this one will be too, but this information will not be available until much closer to the release of this model."
Sounds like an honest answer: They haven't yet decided whether to claim sensitivity at f/8 and won't until they do some more testing. One supposes that if their initial expectations aren't confirmed, that fact could be indicated by a firmware update adding or removing a warning message, soon after release of the camera to the public.
09-25-2014 01:37 PM - edited 09-25-2014 01:44 PM
Only the center point will be f/8 AF capable on the 7Dm2. With a f/5.6 lens and a 1.4 extender, you will drop to half of normal AF speed.