B + W 37mm Infrared Filter # 092 (89B/RG695) #65-026005

B & W offers three filters for infrared photography, each with its' own unique features.

#092.
This dark red filter is primarily for black and white infrared films.
It filters out light below 650 nm.
With color infrared film it produces pictures of a pure red image while making good use of the relatively low sensitivity of infrared films.
Filter factor is approx. 20 - 40.

#093.
This black infrared filter will filter out the entire visible spectrum.
It is used with black and white infrared films with a sensitivity up to 1000nm.
Filter factor is determined by the film sensitivity.


#099.
This orange colored filter blocks the blue and blue-green portion of the visible spectrum up to 500 nm.
It reduces the excessive sensitivity of color infrared films in this spectral range, separates colors more evenly thereby avoiding a blue tint.
Filter factor depends upon the film's sensitivity.