The findings in the below linked report I can confirm are just what I have found with this lens. I also need to mention that I use the DXO v11 to process RAW pictures and they have corrections for both the lens and the camera that do a great job in handling the effects of such a wide angle lens. I have used it now for several weeks and found that the middle range from say +/_ 3mm of 19mm on the lens do sorta go downhill. Otherwise it is great an at 15mm wide open it is awesome in my judgment.
HD PENTAX-D FA 15-30mm F2.8 ED SDM WR Review 
Post #42 by yygomez
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