All it took was one video. Was minding my own business perusing the youtubes and this is what I learned: Swirly bokeh Sharp on center Cheap Inexpensive since roughly a bazillion were made Built in Russia, purchased from the Ukraine M42 screw mount works the treat with Pentax K Provided you get the original Pentax adapter … Continue reading Helios 44-2 58mm f/2: Vintage Swirly Bokeh Machine