Alberto Larios-Saavedra Posted September 27, 2009 Share Posted September 27, 2009 Does anybody know what a CTO2B-ND.09 filter does? At least that's what the small letters written on the filter itself say. I know, it's part neutral density but I don't know what the other part could be, (the filter itself looks like an ND filter, very dark). Link to comment Share on other sites More sharing options...
Tebbe Schoeningh Posted October 1, 2009 Share Posted October 1, 2009 Does anybody know what a CTO2B-ND.09 filter does? At least that's what the small letters written on the filter itself say. I know, it's part neutral density but I don't know what the other part could be, (the filter itself looks like an ND filter, very dark). It´s an 85 combined with ND 0.9. I´m not absolutely sure about the density of the 85 (CTO), but I know that Agfa Gevaert used to produce color conversion filters with the scale CTO1B, CTO2B etc. Link to comment Share on other sites More sharing options...
Premium Member Chris Keth Posted October 1, 2009 Premium Member Share Posted October 1, 2009 I had a sneaking suspicion but I've never seen camera filters that use the naming system of lighting gels. Link to comment Share on other sites More sharing options...
Guest Kevin Thomas Posted October 1, 2009 Share Posted October 1, 2009 Agfa did make a series of colour correction filters using CTB for those increasing the colour temperature and CTO for those reducing the colour temperature. My understanding is that a CTO2B is nearer to a Wratten 81B I would allow for the 0.9 ND and test Link to comment Share on other sites More sharing options...
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