Flatter your lenses
MANY cameras have features that flatter lens performance. The Lens Aberration Correction option in the shooting menu compensates for peripheral illumination (vignetting) and chromatic aberration (colour fringing). But these are only available on genuine Canon lenses, and you may need to download data for some lenses using the EOS Utility program. Also, if you shoot in Raw and don’t process the files with Canon’s Digital Photo Professional program, the corrections won’t be applied. Up-market cameras often also feature AF fine-tuning for individual lenses. For example, when using a zoom lens on the 70D, you can fine-tune values for either end of the zoom range.