Hey Paula,

When I want to check DOF I just push the DOF button on the lower left side of the lens mount. If I need to adjust the DOF I lock the preveiw button down then adjust the focus to get the effect I want, I see what the camera will see when the lens stops down for the exposure. This feature was standard on the A Series Canons, I would hope the EOS cameras have this feature. Proper use eliminates any doubt about DOF.

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