Time to send my 24-70 in to Canon?
 

Sad, but here is my 24-70 without any microadjustments (didn't seem to do anything to how sharp it was in either direction.)

full image:

by , on Flickr

cropped:

by , on Flickr


Shot at ~10 feet wide open @ 70mm. I think it's probably time to send it in to canon. :(


Same lens, same distance... @ f/5.6....

by , on Flickr


All of the shots were taken on a tripod with the self timer... used my flash to shoot at iso 100... and achieved focus lock on the target for each shot... using single point AF.

blah.

I just looked at the full size shots on flickr. it almost looks like there was camera shake in the f2.8 shot. do you happen to live in a 2 story apartment? maybe someone was walking when you took the pic? but then again, that's what everyone told me when my D7000 was backfocusing.

Another thing you could try is to use live view, zoom in, set manual focus, switch out of live view, turn AF on, use single point af and then push the shutter release halfway down. if it changes, you obviously have a focusing problem.

I actually had a similar problem with a rented 24mm f1.4L yesterday. AF wide open sucked and everything was soft. stopped down, it was great. manual focus at f1.6 was sharp as can be though.

Regardless of all that, send it in.

This could be caused by soooo many things. What F stop? What kind of tripod? at 100 ISO even with a flash, how was the surrounding light? What body do you use? Were you walking or moving around when the camera fired (I know youre a big guy... so that could effect stability of the tri pod)...

I would try what justin said... live view, zoom in, manual focus, then fire... might want to get a remote first they are cheap.

for the record, EXIF said:

f2.8 - 1/125th

f5.6 - 1/125th

imo, there looked like enough light front the flash. however I personally would run the test in good natural light. probably mid day outside or something along those lines.

something else to keep in mind, f2.8 @ 70mm is going to be the softest point of that lens.

agreed on all of this.

let us know the results or post them from daylight pictures and steady ground (concrete outside).