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B + W 77mm Infrared Filter 092 (89B/RG695) 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.
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