Adapted Industrial Lens

Happened upon a lens for industrial automation in a surplus shop. Bought it for 25USD and adapted it to be a M42 mount so it can be mounted on almost any camera with M42.

 

I can focus it to infinity and as close as 15cm, adding a few extension tubes make it an excellent macro lens. I think it is better than my Canon EF-100 macro lens at 1:1.

Done