The 150mm has a closest focus distance of 6ft -- which precludes "head" or "head and shoulders" shots.
It also is quite difficult to get the focus dead on -- esp. if the camera focus is not set up absolutely right. Mamiya will rectify this if not correct, but outside warranty it is not cheap: UKP45; not sure what the US price would be.
For landscape work, the 150mm is stunning -- light in weight, and "sharp". Sadly, not an ideal portrait lens.
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