Subal Focus ring - 4FNS326 for Sigma AF 20/1.8 EX macro (Nikon)
For manual focus lens tooth rings must be set up. SUBAL avoids the fastening with screws - and therefore deformation and damage of the lens with precise adjustment
For Subal housing F5 / N10 / N80 / D10 / FS2 / ND2 / ND20 / ND3 / ND30 / ND700 / ND90