Originally Posted by dsm363
I'd echo Sean's comment on this - if everything is working, no need for calibration. You can print AF test charts such as this one which, when used properly, allow you to see if everything really is fine.
One potential issue with sending in one lens and the camera is other lenses. Professionals used to send their body(ies) and entire collection of lenses into Canon so they could all be calibrated together. If the service tech needs to adjust the body to match one lens, it may throw off the other lenses.
As Sean also stated, if you have a body with the AF Microadjustment feature, you can perform smaller adjustments yourself - that's usually all that's necessary. Personally, I use a LensAlign Pro for my AF testing, and most of my lenses have a small adjustment applied (generally ranging from -3 to +3).




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