Lens Tune-Up

The key tool you can use to fine-tune your lens is the AF Microadjustment entry in the Custom Function menu. You’ll find the process easier to understand if you first run through this quick overview of the menu options:

• 0: Disable. Deactivates autofocus micro adjustment.

• 1: Adjust all by same amount. The same adjustment is applied to all your lenses. You’d use this if your camera, rather than just a lens or two, requires calibration. (In this case, I particularly recommend sending the camera back to Canon for repair.)

• 2: Adjust by lens. You can set an adjustment individually for up to 20 different lenses. If you discover you don’t care for the calibrations you make in certain situations (say, it works better for the lens you have mounted at middle distances, but is less successful at correcting close-up focus errors) you can deactivate the feature as you require. Adjustment values range from –20 to +20.