Industar 50mm f3.5 Lens Nikon Infinity + Macro Modification

This modification allows the excellent low cost Russian Industar 50mm lens to be focused to infinity with Nikon cameras using a Nikon to 42mm adapter, (the type without the Hubble telescope type correction lens). It, also allows a degree of macro focus.

The modification is quite straightforward however after this modification the lens will unscrew from the focus helicoil after about 2 rotations when using the lens in macro (take care not to drop the lens).

To modify:
1) Remove the front