Hello!
I’ve been following this thread for a while. I still haven’t passed through all of it yet (127 pages strong!)
I could use your advice if you can spare one.
I’ve got my 7D Mark II about two months ago, wonderful thing (upgraded from an XSi)
In Servo AF I’m getting sharp photos, then a few photos with no focus at all and then sharp photos again (is it the FroKnowsPhoto issue?).
I’m using two lenses: 17-55 f2.8 IS and 70-200 f4 IS. I’m shooting close to maximum aperture (for example f3.2), at least 1/1000 shutter speed and ISO 100 or 200. I sometimes forget to turn off the IS though 
I've upgrade to firmware 1.0.4.
I’m shooting at broad day light and my model is walking towards me.
My AF settings are AF point expansion with 8 surrounding points, I’m using case 2 with tracking sensitivity set to -2, focus is done using the shutter button and both my AI Servo 1st and 2nd image priorities are set to focus.
The last two are the ones driving me nuts. Why would the camera let me take a shot if it is not in focus when I’ve specifically instructed it otherwise??
iTR and anti-flickering are disabled.
Since there is no official Canon where I live, just local representatives, I am worried letting them trying to fix the body. So I’ve started off with letting them test my lenses. The 17-55 just returned today after fixing a front focus issue. It is sharper then what I was used to but the phenomenon happens again. Here it is:
Sharp
Sharp Image
by
Shachar Rubinstein
, on Flickr
And where is the focus here?
Where is the focus?
by
Shachar Rubinstein
, on Flickr
This also happens on my 70-200 but to a lesser extent. With the 17-55 I have around 8 photos without any focus.
I really hope this is a firmware issue and not my specific hardware.
Your opinion will be much appreciated.