Canon TS-E24mm F3.5L Instruction Manual page 14

8. TS-E Tripod Adapter
With some camera models, the tilt, shift and
rotation functions can no longer be used when
the camera is mounted directly on a tripod.
When this happens, fit the optional TS-E tripod
adapter into the tripod mount socket on the
camera before mounting the camera on the
tripod.
ENG-12
9. Exposure
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Shots can be taken using AE (automatic
exposure) as long as the tilt and shift scales are
set to the "0" position.
The use of AE is not recommended when the
lens is tilted or shifted as exposure errors may
result. It is recommended that you use the
exposure values when the tilt and shift scales
are set to the "0" position as a guide and then
take the shot with as many exposure settings as
possible.