I have searched a bit and looked through the reviews, but I still can't seem to narrow down my search. I don't think I can afford any of the Pentax brand lenses, so an off brand is my best bet. I'd like to spend about $50 or less (give or take).
I am OK with it needing to be stopped down for good sharpness. For comparison, I have a Sears 50mm F1.7 Auto MC that is very sharp from about F2.8 and on, with decent contrast and appealing bokeh. I paid about $12 shipped from eBay. I don't expect to necessarily find one that cheap, but who knows?
I have two Sigma lenses - 24-70mm EX F2.8 Macro and 70-200mm EX HSM F2.8 Macro. But, as you probably know, they aren't the smallest lenses. I just want a cheap 135mm to toss around with the 50mm.
Any suggestions on what to look for?