Canon EOS-1D X Manual (en)

Editing with the Lens Correction Tool Palette
With the Lens Correction tool palette, you can use the lens aberration 
correction functions and the Digital Lens Optimizer to correct lens 
aberration in your images and to improve their resolution. This tool 
palette can also be used in conjunction with the sharpness adjustment 
functions. Note that the lens aberration correction functions and the 
Digital Lens Optimizer can only be used with RAW images.
Select an image in the main window, etc.
Display the Lens Correction tool palette.
You can easily make corrections to drops in peripheral illumination, 
distortions in the subject, and color blur which occur by the physical 
characteristics of the lens or slightly remaining aberration.
Note that you can only correct aberration in RAW images which have 
been shot with the following “Compatible Lenses”. JPEG or TIFF images 
cannot be corrected.
Fisheye, ultra wide, and wide angle lenses
EF 14mm f/2.8L USM
EF 14mm f/2.8L II USM
EF 8-15mm f/4L USM Fisheye
EF 15mm f/2.8 Fisheye
EF 20mm f/2.8 USM
EF 24mm f/1.4L USM
EF 24mm f/1.4L II USM
EF 24mm f/2.8
EF 24mm f/2.8 IS USM
EF 28mm f/1.8 USM
EF 28mm f/2.8
EF 28mm f/2.8 IS USM
EF 35mm f/1.4L USM
EF 35mm f/2
EF 35mm f/2 IS USM
Standard and medium telephoto lenses
EF 40mm f/2.8 STM
EF 50mm f/1.2L USM
EF 50mm f/1.4 USM
EF 50mm f/1.8
EF 50mm f/1.8 II
EF 85mm f/1.2L USM
EF 85mm f/1.2L II USM
EF 85mm f/1.8 USM
EF 100mm f/2 USM
Correcting Lens Aberration
Compatible Lenses