TAAB Universal Lens Focus Tab Ring, Black (Bundle Set of 3) Accommodates lens focus ring diameter 1.75 (44mm) to 2.25 (57mm) Accommodates lens focus ring diameter 2.00 (50mm) to 2.50 (64mm) Accommodates lens focus ring diameter 2.50 (64mm) to 3.00 (76mm) May help aid focusing for street or macro photography. Universal design. Slip on and slides off with ease.