Projector lenses like this are not for the faint of heart. There is no focusing mechanism and there are no aperture blades, so even after you mount it to a helicoid ring adapter you have to use (and focus) this 105mm f/1.9 lens wide open at all times. But if you can manage it, the lens rewards you with incredible subject separation and “insane” swirly bokeh.

In the video, you can check out some sample shots and see how freakin’ beautiful its bokeh is.