70-200 f/2.8L II + 5DSR AF consistency problem

[docusync]

Folks, need an advice...

My 70-200 isn't focusing consistently @ 200mm (I mostly shoot at this focal length, don't care much about the wide end). Tried several times to AFMA with FoCal - the software returns "poor fit" because the results are so inconsistent. No problems shooting and calibrating a bunch of my other lenses. What should I do?

Thanks!

[TCampbell]

One of my tests for a lens focus performance (using a commercial focus target) is to put the camera on a tripod, point it at the target, manually run the focus all the way "in" and make the camera focus and shoot... over and over... about a half-dozen times (or more).  Then.... do the same thing except run the focus "out" and make the camera focus and shoot.

The idea is to find out if the direction of movement makes a difference.  If it does make a difference, the lens may have excessive backlash in the focus gears and likely needs service.

[Mitsubishiman]

I have the same camera and lens, not experiencing what you are, lens is a tight fit always auto focuses at 200mm perfectly, for that matter at any length, I will be interested to hear what they say in case mine starts to have issues.

[docusync]

Forgot to post an update. I had to send the lens along with my 5dsr. CPS have repaired the lens. They said it was faulty because I probably unmounted the lens while the camera was on. Not sure if that's the case, since I remember the lens was finicky from the day one. Anyway the repair was cheap and quick, good experience. No doesn't require any AFMA anymore.