Long pass filter 850nm

Optical band-pass filter is a kind if optical elements which can let the specially appointed wavelength light pass but other wave band light cut.Usually we use the UV-light wave band, visible light wave band, close infrared light wave band ( such as 850nm,940nm), far-infrared light wave band through but other wave band cut (or absorb), to reach the customer’s request of the product.In the CCTV industry, it mostly use to restrain the strong light and use with the infrared LED to screen the car license plate in the city road traffic, it’s advantage is that his image effect is better than commonly OLPF.if you have special request ,please give us a customer order.Natural of DefectEffective areaInclusion/Bubble/Pit40µmMaxDustCan be blew away is acceptableScratch20µm Max.In width; Invisible after rotatedEdge ChipsMax.0.3mmMemarkInspection environment: With class1000 clean room/class100clean booth and 60W bull lamp and around 15cm to objective with normal net eyes.