24-105 front focusing, or ?

[HDNitehawk]

What puzzles me is why I would need to send the body in, too, since when I bought this lens, it worked perfectly on my 5DII. I had tried an AFMA on it, previously, but it didn't give me satisfactory results, being a zoom lens. I wasn't sure which end I should do the adjustment, so I left it as is. But, that wasn't a negative, since the lens was quite sharp without any adjustment.

So, now, I've got a lens that isn't what it was when I bought it, and all I would like Canon to do, is bring it back up to the specs that existed when I bought it, originally.

The components inside the camera are very sensitive. If there off a bit they will send the wrong information to the lens. You could have bumped it or shaken it, or just general wear and tear changed things. If you compare the lens all the way through all of the settings then you can decide what is appropriate. There is nothing wrong with switching settings in the field if a subject is closer or further. Or you could do an average of the two ends. I prefer to set to the long end since the DOF is narrower there.

It my understanding that there is variance in the mfg process, notice the latest release of the 24-70 II. So it is best to send camera and body in that way Canon can make sure it matches manufactures specs in performance.

[shutterdown]

The components inside the camera are very sensitive. If there off a bit they will send the wrong information to the lens. You could have bumped it or shaken it, or just general wear and tear changed things. If you compare the lens all the way through all of the settings then you can decide what is appropriate. There is nothing wrong with switching settings in the field if a subject is closer or further. Or you could do an average of the two ends. I prefer to set to the long end since the DOF is narrower there.

It my understanding that there is variance in the mfg process, notice the latest release of the 24-70 II. So it is best to send camera and body in that way Canon can make sure it matches manufactures specs in performance.

Rick, when you say "bumped it" do you mean the camera? If so, I guess it's possible that I could have bumped it.

This OOF issue is severe, though. I should have gotten at least 7 feet of focus BEHIND the subject, and I didn't. I did get sharp focus with my 24-70 (version I).

Something changed with the lens, and I have a hard time believing it's my camera/lens combo with the 24-105. When Canon sells a lens, they might do it on an ideal body, true. But, they just sell the lens, and people put it on their cameras, and none of those cameras have been calibrated with the lens they bought. That means, something funky happened when they "fixed" my lens.

I do AFMA on my primes, but I've not had good luck with the zooms.