An Uncommon Sigma 200mm Scalematic & Other Marco Focusing Nikon Fit Lenses. The Sigma 200mm Scalematic is a macro lens with a difference. After focusing it in the normal way there is an additional 'fine focus' ring at the front of the lens for that extra, critical focus, Nikon Ai fit and tested OK on Nikon DSLR (see final image). Also a selection of Nikon fit macro focusing zoom lenses by Sigma, Tokina, Soligor, etc. showing normal signs of use.