Need some help! 7D not focusing

Ok so i was out the other day shooting with my 7D using my 24-70 2.8 lens and everything was great, as soon as i put my 70-200 2.8 on i was shooting and went to review my photos on the lcd and all the photos were blurry.

So i put on a friends 70-200 and everything was again sharpe with the same setting. So i figured my lens needed to be sent in for repair. Took it in and it tested fine.

Today i put my 24-70 on again to shoot and now it don't focus at all.

Does anyone know what it could be or has it happened to you?


Really need some more ideas, my brain is going crazy tryin to figure it out!

Are the contacts clean on the camera?

Check the auto focus switch on the lens.

Contacts are clean. Switch was on and i wiggled it back and forth and still isn't working.

does the AF motor move back and forth? in other words, does the AF hunt but never acquires? or it doesnt move at all?

what happens if you hit the back AF button?

When i had my 70-200 lens on it would lock on and looked focused until i viewed it on the lcd then it was blurry

When i had my 24-70 on it never locked on in focus, the motor kept trying

whats the EV like? is there enough light or contrast for AF to work? maybe its a little too dark? sample pics?

-MasterChief- wrote in post #15192743
whats the EV like? is there enough light or contrast for AF to work? maybe its a little too dark? sample pics?

Sometimes this happens to me. In my case it seems like the lens freezes. I manually focus then switch on auto focus and it works again.

Do you have C.Fn III-4-1 set? That can cause exactly that behavior, under certain circumstances.

Ok so after cleaning EVERYTHING it has to be something with my 70-200 lens.

When i shoot at 200mm it does it BAD, camera says it's in focus but then when i view the lcd its blurry

I'll post 2 photos in just a min

Tripod used for both shots, focused on the G

http://i1027.photobuck​et.com …20Shots/TestSho​t123mm.jpg

http://i1027.photobuck​et.com …20Shots/TestSho​t175mm.jpg

how good is your tripod and head? 1/40 on a good tripod should be tack sharp but it kinda looks like motion blur to me. specially on the 175mm shot. the smooth and dry text on the bottle has cues of motion blur.