Coded Lenses

You don't need to code them, but it's a whole lot less bother than not coding the wide angles. Without coding you need to repair the cyan corner effect on each wide-angle shot using a separate postprocessing step with 3rd-party software.
 
If you are using a lens wider than 35mm you have the following choices:

No IR filter, no code: your shots will suffer from IR contamination, blacks will be some degree of magenta and foliage will not be true, at the very least.

IR Filter, no code: You will have the cyan corners that Ben mentioned. This can be fixed in processing with Cornerfix or other software.

IR filter, coding, camera menu set to IR filter ON: The M8 will correct the corners for you.

This "coding" could be handled in a menu item, but Leica has chosen not to implement this capability.
 
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