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I would almost be inclined to suggest that if "more information" is needed that he should start with a switch to a higher resolution camera.
given that he is studying some sort of jet (water or otherwise) i would think that a higher resolution would allow for more detailed scrutiny of the fluid and its dynamics. if thats what he is trying to achieve, at 640 x 480 I dont think different lenses will cause that much change (unless one is VASTLY superior to the other. and then the choice would be pretty obvious)
the distortion of a wider anglelens will be more pronounced because you are packing more field of view onto the same amount of pixels, eventually resulting in blurry edges. and lost detail. where as a closeup lens (macro) would be putting less field of view onto the same amount of pixels producing a sharper image of a smaller area.
thats just how im thinkin'
(please feel free to correct any falsitudes I have spoken)
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"making the colorblind queasy since 1970" 
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