filters are designed by their manufacturers to transmit or absorb different wavelengths of light. and they are widely used in scientific experiments and industrial applications where that change is necessary. vy optics photoelectric technology co.,ltd. can supply a full range of filter. they are short pass filter, long pass filter, band pass filter, ultraviole filtert, infrared filter, heat absorbing filter, and color temperature conversion filters. we use material by china to schott, hoya, and other manufacturers to process them. metallic films, colored glasses and thin dielectric films filter are all available per your requirements. filters are designed by their manufacturers to transmit or absorb different wavelengths of light. and they are widely used in scientific experiments and industrial applications where that change is necessary. color separation filter,neutral density filter,filter,short/long wave pass filter,bandpass filter and interference filter specification of our color filter as follow: material:filter glass,bk7 dimension: 4mm-160mm - 0.20mm squares/rectangles:1mm-165mm thickness:0.5mm-4mm thickness tolerance:+/-0.01mm-0.1mm paralism: up to 3 arc minutes edges:fine ground flatness:up to lambda/10 surface quantity: 80/50-20/10 scratch/dig