TL;DR: got any recommendations for a cheap fast manual non-radioactive 50mm prime? I have an a6500 with the 16-70mm kit lens and also the 30mm f1.4 Sigma lens, which I love by the way. However, I want to use some legacy primes to experiment with different focal lengths, perhaps a tilt adapter later on, etc. I also don't want to use a radioactive lens, because firstly I don't have a basement in my small apartment to "hide" the lens away when I'm not using it, secondly, I have a dog, thirdly I just don't want to take the risk. I have shortlisted it to the following: Minolta rokkor-md 50mm 1.4 - might be radioactive?? but f1.4 is very fast and apparently it's sharp too Helios 44m 58mm f2 - this is a lens primed for its swirly bokeh but I've heard on crop sensor bodies the bokeh doesn't swirl as well Auto-Takumar 55mm f2 - this has great "soap-bubble" bokeh, and works well on crop mode. The only thing holding me back from pulling the trigger on this lens is that it may be radioactive (according to the Angry Photographer it's not but others say it is, and Pentax was notorious for radioactive lenses in that era) and also it's very RARE and fairly expensive. I'm in love with the look of the Takumar lenses, by the way. Konica 50mm Hexanon f1.7 - this lens is very sharp wide open and very inexpensive, don't think it's radioactive (is the bokeh any good?) Nikon 50mm f/1.8 AF/AFD - not that vintage but fairly cheap and certified non radioactive (lens-makers stopped using thorium in the mid-80's) Anyone got any suggestions/tested the radioactivity of these lenses? Also, does the radioactivity vary from lens to lens? Thanks.