B+W 092
This dark red filer is for black and white ifrared films and filters at light below approximately 650nm. It allowss pictures of a pure red image while making good use of the relatively low sensitivity of infrared films. Filter factor is approx. 20-40.

B+W 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.

B+W 099
This orange colored filter blocks the blue and blue-green portion of the visible spectrum up to approximately 520nm. It reduces the excessive sensitivity of color infrared films for this spectral range, helps avoid blue tint and differentiates colors more evenly. Filter factor depends on film sensitivity.