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Technical Support / Opinions on 3rd party repair services

« on: February 11, 2013, 08:39:43 PM »

My 70-200 f4.0L slipped out of a backpack a couple of years ago straight down onto concrete.  It shattered a UV filter I had on at the time but focus remained fully functional.  (The backpack with the not very secure zipper was relegate to never leaving the house again.)

With micro-focus at +9, it's fairly accurate but I assume it's decentered in some funky way and would like to get it calibrated.    Canon Repair's "just send it to us and we'll give you a quote" seems a bit open ended.   Does anyone have experience with one of the independent service providers? 
Like:
http://www.unitedcamera.com/canon-ef-70-200mm-f/4l-usm/
or
http://www.precisioncamera.com/professional-camera-repair.html