Product: Infrared Cut-off Filter Model: ICF2139 Size: 27mm - 82mm, multiple options as above Purpose: For camera modification, color restoration and color correction Coated version: Based on the regular version, double - sided AR anti - reflection coating and double - sided waterproof and anti - scratch coating are applied, which can effectively prevent oxidation and prolong the service life. The AR anti - reflection film improves the transmittance and reduces the mirror reflection; the protective film increases the mirror hardness, reduces scratch damage, and makes the mirror smooth and easy to clean. Note: Only applicable to color restoration after modifying to transparent glass; it has no effect on camera modification with specific wavelengths.