I\'m responsible for several dozen copies of the 85 f1.2 and more than several dozen camera bodies to mount them on. I can tell you firsthand that every copy of the 85, mounted on half a dozen cameras, will backfocus on one, frontfocus on another, be perfect on a third, etc. Same thing if I take one camera and mount 6 different 85 f1.2s on it.
Every engineering spec is +/- something. Not \"exactly here\". Since your lens is able to be microfocus adjusted to sharpness, the standard check for specifications is probably going to come out \'within standard\'.
That being said, you can help yourself a lot by giving the tech specifications when you send a lens in (I get 6 - 15 lenses a week repaired, they\'ve taught me pretty well how to give them the information they need to fix it the way I want it fixed). In this case \"lens is backfocusing\" gets you a standard \'check for within spec\'. Something more specific like \"Lens requires -14 adjustment at 10 feet, but still backfocuses on more distant images\" gives them much, much more information as to what needs to be corrected.
Dec 15, 2009 at 05:19 PM
Previous versions of RCicala's message #7893664 « Very Frustrated with Canon Service!! »
