... bubble 3. good surface quality 4. good reputation ir cut off filter1.wavelength:from 180nm to 2500nm 2.Surface quantity:40 ... ~±0.02mm5.Dimension according to the requirementOptical filter(ir cut off filter) : UV filter, skylight filter, red filter, yellow filter, blue filter ... filter, violet filter, infrared filter etc. Optical filter(ir cut off filter) is the kind of optical instrument which is used ...