Canon EOS 1Ds Mark II Instruction Manual page 83

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You can take up to eight spot meter readings for one picture. If you press
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the < > button to try and take a ninth spot meter reading, no spot
meter reading will register.
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The exposure setting obtained with multi-spot meter readings will be
canceled in the following cases:
(1) After taking the last spot meter reading, 16 seconds elapse.
(2) You press the <
(3) After taking the picture, you let go of the shutter button.
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Multi-spot metering can be fixed at the center or linked to the active AF
point.
Q W
>, < >, or <
E
> button.
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