Used for photography with infrared films.
R72 passes only infrared rays above 720nm.
RM90 passes only that above 900nm.
Often used in crime detection, medical photography, detection of distribution of vegetation, etc.
The Hoya 52 Infra-Red Filter is commonly used for Artwork, Image manipulation and more.The Hoya 52 Infra-Red Filter is most used by customers who consider themselves to be a Enthusiast among others.The Hoya 52 Infra-Red Filter is popular because customers like the following qualities of the Hoya 52 Infra-Red Filter: Clear optics, Consistent effect, Easy to use, Firm mount and Strong construction