Gary, I am now on my second 50 lux pre-asph. I foolishly traded the first one in on the Noctilux. I personally prefer the pre-asph to the Asph. The PA for short, is like a mini noctilux F1. It has the same type of bokeh, but it is more subtle. Sometimes the Noctilux can be too much, whereas the PA is a little less. The lens does yield purple fringing, and it is not as sharp as the Asph version. It is as Zhanghue said, it is a lens for art.
