Reveal the true colours and shape in professional dental photography! CROSS-POLAR filters allow you to see more when performing cosmetic dental restoration. It works by eliminating undesirable surface reflections and unveiling the inner dental structure. CROSS-POLAR filters fit the following macro flashes: Canon MR-14EX, , Canon MT-24EX, Canon MT-26EX-RT, Metz MS-1, Nikon R1 / R1C1 system and Sigma EM-140DG.