70-200 f/2.8L IS II focus issue

[jaayres20]

I have had my 70-200 for almost two years now and it has performed flawlessly up until now.  I have shot about 50 weddings with it and no issues.  Now it it having problems focusing at 200mm.  70-185 it is very sharp but at 200 it almost looks like slight motion blur or just plain out of focus.  I can get it to focus accurately sometimes but most of the time it is just off.  I am sending it in to Canon but do lenses get out of calibration like that?  It has never been dropped or mistreated.  On another note how often should you just send your lens it to get it checked over and professionally cleaned?   Especially if it is used a lot. 

[curtisnull]

I send every body and every lens to Canon every year.

[East Wind Photography]

Yes it can get out of spec.  So can your camera body.  Is it common?  No.  Have you tried to do a micro focus adjustment (MFA)?  I use Reikan Focal to keep my body and lens in sync.  For the cost of the software, you will be paying shipping and insurance to send it to Canon for the same procedure.

http://www.reikan.co.uk/focalweb/

Consider the Pro version.  Not much more but way more useful features.

Which camera bodies do you use?

[JoeDavid]

I had to send a 24-105L in for the same reason.  I have owned it for several years and it has worked well but, during the summer on a trip to Scotland, it didn't perform good at all.  When blown up, images were softer than they should have been, given the shutter speeds used.  I sent it to Canon and they corrected the various lens focus adjustments (including the "tilt" focus which I don't think MFA can address) and checked the IS unit.  When they returned it to me it was corrected to be within "Factory tolerances".  It's back to performing as good as ever.  Cost me nearly $200USD though…