Lens Lab
    Tamron SP 70-150 mm f/ 2.8 Soft Adaptall-2 model 51A
    Tamron SP 70-150 mm f/ 2.8 Soft Adaptall-2 model 51A

    Tamron SP 70-150 mm f/ 2.8 Soft Adaptall-2 model 51A

    70–150mm · f/2.8

    Overview

    The Tamron SP 70-150mm f/2.8 Soft (51A) is a rare, specialist portrait zoom with a unique variable soft focus effect, adjustable from 0 to 3. With soft focus off, it is very sharp wide open throughout the range. It produces extreme flare and chromatic aberration. Build is stout but heavy at ~800g, and the Pentax K-A mount is unreliable. It suits photographers seeking a controllable, unique look for portraits or creative subjects, though it is a matter of taste.