I have both Pentax and Konica 50/1.7s and they're both great, sharp from f2.2 (or whatever the next stop is). I had a Super Takumar and it was an amazing lens. 50/1.4 and while it wasn't good at 1.4, it was as good at 1.7 as the other two are at 2.2. So I get a half a stop bokeh from this lens. This is, I don't want this M42 screw mount, yellowing, slightly radioactive lanthium coated lens. So, what to replace it with? A Konica 57/1.2 or a Minolta 58/1.2 would be good but these are $400 lenses. So, for around $100, would I be limited to 50mm f1.4 lenses? I know there are more than a few of them. Actually, I had a 57/1.4 (Konica) but actually returned it to the seller because the focus wasn't smooth. I'm kicking myself for not seeing how she did at f1.7...I can't imaging it's better than the Takumar 50/1.4 @ 1.7, but maybe it is. I should try to get that lens again....or one like it. Recommendations? Here's the Super Takumar screw mount at f1.7. What other lenses for under $100 are this good or better?