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I think your canon camera will meter correctly in Av/M modes, simply choose your aperture setting on the lens, the body will figure out the rest. I don't recall any major issues with metering on any of the bodies I've tried that lens on.
obviously the body can't control your aperture setting, but it should be able to meter correctly at any setting you desire.
I'll often focus at f1.4, dial it down to whatever I need (on the lens) and then fire away.
then I curse who-ever-the-heck designed that pos hood. (now firmly taped in place)