Pros
High and very even sharpness
Smooth bokeh
Fast silent AF
Weather resistance
Well controlled CA
Excellent flare resistance
Cons
Limited aperture range
Lower edge performance at 105mm
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https://www.ephotozine.com/article/hd-pentax-d-fa-28-105mm-f-3-5-5-6-ed-dc-wr-lens-review-29352
