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>>94789 I'm actually not sure, but that's what Ken Rockwell tells me, and my personal tests confirm it (i.e., when I hold down the DoF preview on my Rebel and flick the aperture dial, there's a noticeable change from f/36 up to f/2.5, but no further. And I can't manually focus my 50/1.8 worth a damn at anything less than f/2.5.)
You can't really test it that way with your D40 since it doesn't have a DoF preview, but you can borrow a 50/1.8 and actually try it out. I'll happily stop talkin' trash if you can prove me wrong. :)
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