Size:25,27,28,30,30.5,34,37,40.5,43,46,49,52,55,58,62,67,72,74,77,82,86mm
Material:Aluminium alloy frame and high quality optical glass 
Wavelength Coverage:680NM,720NM,760NM,850NM,950NM
Payment:
1. 100% payment in advance
2. 30% payment in advance, the balance against B/L copy

Function: 
Infrared filter 850nm are designed to reflect or block mid-infrared wavelengths while passing visible light. They are often used in devices with bright incandescent light bulbs (such as slide and overhead projectors) to prevent unwanted heating. There are also filters which are used in solid state (CCD or CMOS) video cameras to block IR due to the high sensitivity of many camera sensors to near-infrared light. Infrared filter 850nm typically have a blue hue to them as they also sometimes block some of the light from the longer red