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#1 Alberto Larios-Saavedra

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Posted 26 September 2009 - 10:54 PM

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).
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#2 Tebbe Schoeningh

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Posted 01 October 2009 - 01:00 PM

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.
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#3 Chris Keth

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Posted 01 October 2009 - 04:21 PM

I had a sneaking suspicion but I've never seen camera filters that use the naming system of lighting gels.
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#4 Kevin Thomas

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Posted 01 October 2009 - 06:08 PM

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
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