Try adjusting the mid value of the alphas to 50 (or 0.5, whatever the middle of the range is) after you import them. And set your displace value intensity to 0.5 as well for each udim.
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Oh and, moreso than the 50/1.7, for near the same cost or a little more of the new Sony 50/1.8, you might be able to pick up a Minolta 50/1.4, at which point there is no comparison. These sell anywhere from $150-300.