8x red filter and 25 red filter

Discussion in 'Beginner Questions' started by canwewin, Oct 22, 2012.

  1. Posting here because I'm not sure where to post!
    What's the difference between a 8x red filter and a 25 (or 29) red filter.
    I own a zeiss ikon 8x red filter and I'd like to try an Infrared film, so i wanted to know if it's good, say like a 25 red filter which is recommended for IR photography.
  2. Thank you!
  3. I have a Hoya R25 and it is a 3-stop (x 8) filter so your Zeiss filter will be the same. The 29 is a deep red and is a x 20 filter (about 4 1/2 stops). I used to use the R25 with Kodak HIE but since that disappeared I have to use an R72 with the current IR films.
  4. Thank you Chris

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