Canon EOS RP Instruction Manual page 420

Selecting the Metering Mode
By default, the camera will set the exposure as follows.
o
With [ q ] (Evaluative metering), holding down the shutter button halfway will
lock the exposure setting (AE lock) after focus is achieved with One-Shot AF.
In the [ w ] (Partial metering), [ r ] (Spot metering), and [ e ] (Center-weighted
average metering) modes, the exposure is set at the moment the picture is
taken. (Pressing the shutter button halfway does not lock the exposure.)
With [ 8 C.Fn I-7: AE lock meter. mode after focus], you can set whether or
o
not to lock the exposure (AE lock) when focus is achieved with One-Shot AF
( = 529).
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