For sale herein is the reason for my WTB ad the other day. This appears to be a perfectly well-behaved Pentax 50mm lens, but it is in fact nothing of the sort due to a sluggish diaphragm. Nothing is jammed or bent, the action just is no longer snappy. Glass is simply sparkling. If you are clever mechanically then have a go for short money and benefit our beloved APUG at the same time. If $5 is too much then let me know your pleasure. Enjoy!!