It's been said many times on PDML that there's little advantage in using an
extra-sharp lens unless you fix the camera to a tripod. I'm having
difficulty following the math. Won't a sharper lens partially compensate for
camera shake?

Here's what I mean: Suppose you have two lenses. Lens A resolves 100 lines
per millimeter; lens B resolves 60 lpm.

Now suppose that you shoot a series of 1/30-second handheld exposures with
each lens. Your pictures are noticeably less sharp than they would have been
if you had used a tripod.

But aren't you still better off for having used a sharper lens? When your
hand moves, isn't sharpness reduced by a fixed percentage--say, by 50% If
so, 50 lpm (100/2) still beats 30 lpm (60/2). The sharper lens wins.

Or does blurring work as an equalizer, permitting, in this case, say, no
more than, say, 30 lpm, no matter how sharp a lens is used?

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