Kodak 3 x 3" #87 Opaque Infrared Wratten Gel Filter - This filter is for black and white infrared film when you only want to transmit the infrared spectrum and none of the visible spectrum. Filter factor is determined by the film sensitivity.
Most Kodak gelatin filters are available in 3 x 3" (75 x 75mm), 4 x 4" (100 x 100mm), 6 x 6" (150 x 150mm), and 14 x 18" (350 x 450mm).
Type
Wratten
Size
3 x 3" (75 x 75mm)
Grade
87
Filter Factor
8 (+3 stops)
Multi-Coated
Not Applicable
Rotating
Not Applicable
Effect
Transmits the infrared spectrum only and no visible light