On the front of the Canon DSLRs there's a Depth of Field preview button which I just figured out how to use. I thought that when it darkened part of the screen it was showing the area that would not be on focus. As with many things, I was totally wrong.
I learned the truth at http://www.slrphotographyguide.com/camera/depthfield-preview-button.shtml. Not much of a web site but the info seems good in this case.
So my updated understanding of the DOF preview button is that the default viewfinder view is with the aperture wide open. This is why the DOF preview button doesn't seem to work with a large aperture. Crank down the aperture and you will begin to see the preview image get darker which is caused by the aperture closing (hence less light). The important thing that I missed in all the shading is that the sharpness of the image does in fact change based on the f-stop.
I foresee myself using this a lot now that I actually know what to look for.
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