On/Off Dial on 40D

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Just noticed the little dial has a third position... On, off or... In line with that little line next to the wheel... Anyone tell me what it does?

Thanks

 

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If it's the same as the 1D, it turns the camera on but disables the rear control wheel etc.

Not that, scroll wheel still works

 

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Hmmm all the way up to the little mark should turn everything on, when it is set to just "on" the rear control wheel should be disabled? (Sorry for not being clearer). If it's not that I don't know

Yeh, when set to 'On' you can't use the wheel for exposure adjustments etc. (but you can still use it to scroll through pictures obviously). The - is for creative mode basically.

I think the idea is to prevent accidental over / under exposure maybe

Ah yes, that's it. Thanks guys