Comments about B + W B + W 46mm UV/IR Blocking #486 Glass Filter for Blocking Ultra Violet and Infrared Radiation:

i found out that any video camera with or with out night shot can see flames with these filters as long as there hot regardless if the smoke is thick black you will see it. and humans do not have negative effects like trees and so on so real easy to spot them in ocean or in heavey bush. the clothes and body is normal while everything else is a negative like that of photograph negatives. but you do need strong sunlight for it to work