Check the listing for details. CatLABS LENSTAB Lens Focus Tab (taab). Condition: New. Listed at 14.00 USD. CatLABS LENSTAB Lens Focus Tab NOW AVAILABE IN WHITE or BLACK (use pull down menu to select)Available in three sizes to fit most lensesUse Lens TAB to achieve fine focus control with a convenient non permanent rubber finger focusing tabUnobtrusive and compact - becomes part of your lensRigid finger tab provides control when focusing for a smooth and tactile feelEasily removable, no adhesive, non destructive modification that will not harm your lens Will the Lens TAB work with my lens? There are TWO measurements you need to make in order to ensure proper fit:measure the fit of your lens by either using the “Diameter” or “Circumference” as a measurementmeasure the width of your focus ring to make sure that the TAAB band is of appropriate thickness Small • Fits lens diameter – 1.75″ (44mm) to 2.25″ (57mm)• Fits lens circumference – 5.5″ (140mm) to 7″ (178mm)• Ring thickness – 0.25″ (6.35mm) Medium • Fits lens diameter – 2.00″ (50mm) to 2.50″ (64mm)• Fits lens circumference – 6.25″ (158mm) to 7.85″ (200mm)• Ring thickness – 0.3125″ (8mm) Large • Fits lens diameter – 2.50″ (64mm) to 3.00″ (76mm)• Fits lens circumference – 7.85″ (200mm) to 9.25″ (235mm)• Ring thickness – 0.50″ (13mm) CatLABS is a Brick and Mortar, all-analog camera store in Boston MA. Call us or come visit us in person at 3514 Washington St., Jamaica Plain, MA 02130(Mon-Fri 9-530 or any time, on our website)