AE-L doesn't work on manual exposure but auto ISO?

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qianjin Regular Member • Posts: 184
AE-L doesn't work on manual exposure but auto ISO?

I understand AE-L is supposed to lock the shutter speed and aperture when it's in P, S, A mode, not in M mode. When I turn the dial to "T" and set the shutter speed to whatever I want, and leave the ISO to auto, I was expecting the AE_L will lock ISO because I thought ISO is part of the exposure. However it is not so. The ISO keeps changing every time I half press the shutter release no matter if I keep depressing AE-L.

Did I have the false understanding of ISO being part of exposure or AE-L only deals with SS and aperture?

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