It works within tolerances; if you happen to have a body that is a tad backfocusing but still within the tolerance level and you have a lens that backfocuses, again within the tolerance level, the combination of the two will result in a more pronounced backfocusing. That's why the new pro bodies have the MF adjustment feature for users to do their own minor adjustments without having to drop off or sending the lens in to the service center.
abam wrote:
my canon bodies don't present focusing issues in concert with any other lens in my meager repertoire.
my 35L focuses incorrectly on more than one body.
in my situation, it's the lens.
Sorry to hear that
Also consider that the 35L is an old design that can't be calibrated very precisely by using the newest calibration software. Instead calibration can only be done by making adjustments to the actual hardware of the lens. This can only be done in rudimental steps. That doesn't mean it can't be done properly. But it certainly means that the tech will have to put some more effort into it
I bought a 70-200mm f/4 L lens from B&H in 2003 or 2004. It had severe backfocus problem. I returned it and bought one from Amazon, hoping I'd be lucky this time. I was - that copy focused perfectly and was sharp.
My current lens 70-200mm f/2.8 L has been shipped to Irvine to check a front-focus issue. It is sharp, but not where I want it focus.
So, Canon's quality control being second-grade is not a myth.
