Review on 📷 Pentax 31mm F/1.8 FA Limited Lens for Enhanced SLR Photography on Pentax and Samsung Cameras by Dawn Jones

Given the reputation of this lens, I suspect I've picked up a rare bad specimen. Mine on the Pentax K-1 didn't produce a sharp image, even at the aperture. No fine-tuning of the autofocus helped. With the calibration tool it was not possible to really sharpen part of the image. The purple border was terrible. I didn't see any obvious flaws or dirt that could explain the problem. I have a 77mm lens and it's really amazing so I was really surprised by the poor performance of the 31mm lens I got. Luckily, after almost a month of trying to get it to work, Revain let me return it for a full refund. Now I'm trying to decide if I'll try to make a better copy or use the Sigma 35mm ART instead.