5D mk4 focusing issues

klickflip

EOS T7i
Jan 16, 2013
97
0
Hi, I’ve had a few focus problems so far which in;Oates before about with my 5D4 , but those were tracking walking people / models and have learn now to get the focus tracking on earlier than I think / used to do with other 5D series .
And a basic AMFA adjustments - which often I have to do for each distance scenario on the fly at a job.

But latest one is crazy , shooting a still life , whisky bottles and the focus on one shot mode is really unreliable.
I am shooting it f2 on mainly 85 f1.2L and 135 f2L and 50 1.2 L lenses .
Room light + modelling lights. Labels are slightly metallic , but plenty of high contrast detail for it to grab focus on.
And it’s not doing that consistently.
I never used to have to check focus in situations like this. Or the variation would be really subtle , so I’d shoot 3 shots and use the best one , but even the worst four one was totally acceptable.
Now I have to shoot 5 to 10 shots to get one in perfect focus , and sometimes more!

So each shot on the same spot in one shot mode is a different focus , some times inches out , I have to shoot several shots to get one in perfect focus .
Even doing AMFA calibration is unreliable as , I cannon guarantee a basic static focus start point to work from to gauge any AMFA adjustment.

Has anyone else having problems with their 5D 4?

Now I’d better add I’m a professional photographer of 15 years , I know what I’m doing , and limitations , and shoot quite technically , so please don’t ask / state the obvious .
Everything I’m doing is right by previous cameras and situations and not been a problem.

Cheers!
S
 

Mt Spokane Photography

I post too Much on Here!!
Mar 25, 2011
15,408
667
Are you using live autofocus or phase detect? The phase detect sensor can get dust on it, causing erratic focusing, or a host of other issues. I'd have Canon work on it, something is wrong, mine is fine.
BTW, try live PDAF and see if it works. That might narrow things down a bit.