I own an Industar 61L/Z 50mm/2.8 lens (M42) which I am very fond of because it has a very l-o-n-g, smooth focusing helix. It lacks somewhat in contrast, but so what 
Here is a sample. Nice bouquet, eh?
Now, another Russian company made the Volna 9 Macro lens.
Quite similar. Or at least almost the same…
Is there anyone having hands-on experience from a Volna?
Have fun!
Claes in Lund, Sweden