Canon EOS 70D Operation Manual - Page 166

q Selecting the Metering ModeN w Partial metering Effective when the background is much brighter than the subject due to backlighting, etc. The metering is weighted at the center covering approx. 7.7% of the viewfinder area. r Spot metering This is for metering a specific spot of the subject or scene. The metering is weighted at the center covering approx. 3.0% of the viewfinder area. e Center-weighted average metering The metering is weighted at the center and then averaged for the entire scene. With q (Evaluative metering), the exposure setting will be locked when you press the shutter button halfway and focus is achieved. In the w (Partial metering), r (Spot metering), and e (Center-weighted average metering) modes, the exposure is set when the photo is taken. (Pressing the shutter button halfway does not lock the exposure.) When is set, can be displayed in the viewfinder (p.376). 166