canwewin Posted October 22, 2012 Share Posted October 22, 2012 <p>Posting here because I'm not sure where to post!<br>What's the difference between a 8x red filter and a 25 (or 29) red filter.<br>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.</p><p>Thanks</p> Link to comment Share on other sites More sharing options...
dhbebb Posted October 22, 2012 Share Posted October 22, 2012 <p>Here's some info:<br> <a href="http://en.wikipedia.org/wiki/Wratten_number">http://en.wikipedia.org/wiki/Wratten_number</a><br> Your Zeiss filter is probably like a Wratten #25.</p> Link to comment Share on other sites More sharing options...
canwewin Posted October 23, 2012 Author Share Posted October 23, 2012 <p>Thank you!</p> Link to comment Share on other sites More sharing options...
chris_waller Posted October 23, 2012 Share Posted October 23, 2012 <p>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.</p> Link to comment Share on other sites More sharing options...
canwewin Posted October 23, 2012 Author Share Posted October 23, 2012 <p>Thank you Chris</p> Link to comment Share on other sites More sharing options...
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