Hoya 77mm RM90 Infrared Filter
- Product Dimensions: 0.75 x 4.5 x 4.5 inches; 0.2 pounds
- Shipping Weight: 0.2 pounds
- ASIN: B00509SXFK
- Item model number: HOYAB77RM90
- Average Customer Review: Customer Reviews
Used for photography with infrared films. lnfrared film is also sensitive to ultraviolet rays and the shorter wavelengths of the visible spectrum so it is necessary to filter out all but the infrared rays. RM72 passes only infrared rays above 720nm. Often used in crime detection, medical photography, detection of distribution of vegetation, etc.