I hear a lot of good about Pentax 50 / 55 mm lenses in regards to bokeh. Never been too crazy about Nikon's 50's. Currently have an Ai 50 f2 that is good, but still am intrigued by something faster and smoother. The 50 Ais f1.2 is an obvious but expensive option. I have machine shop access and for about $100 I could make a run at adapting a Takumar. I know that there is about a 1mm diff in flange to film so I would have to try removing about this much material to get infinity focus, just wondering if anyone else has tried a similar mod. I would like to use this with my F3 so not interested in getting another body to carry and it sounds like a fun project. Any suggestions...? Thanks.