Helios 44M-4 is famous of its special swirl bokeh effect. It is a M42 mount lens with focal length of 58mm and aperture of F/2.
I dug out one from my old inventory. I bought it almost two decades ago when I was traveling in Russia and some Eastern Europe countries. I still remember it costed me merely $10. It have never used it because I could not find an adaptor to make it work with my EOS cameras. I’ve almost forgotten its existence. Until recently I bought a M42-to-EOS adaptor (with a focus confirmation chip).
Screwed it on the adaptor.
Put it on my Canon EOS 40D. The family photo is here.
I will test it against my beloved EF 50mm F1.4 USM and post the findings here.