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  1. #1
    E76
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    CTO in Place of 85B Filter

    I have quarter, half, and full CTO gels along with bunch of tungsten slide film I would like to use outdoors, but no 85B filter. Is it possible to use a CTO in place of an 85B? What kind of results can I expect? It seems like it might work, but I cannot be sure.

    Thanks.

  2. #2
    JBrunner's Avatar
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    Color wise the CTO will work fine. Optically it will depend on how good the gel is and where you put can it.

  3. #3
    E76
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    Any idea as to what the required exposure compensation with any of the CTO filters would be? So far I have found conflicting sources of information stating that a full CTO is identical to an 85B (+3/4 stop) and others saying a full CTO is actually warmer than an 85B, meaning the correction would be closer to +1 stop, if not more. 1/3 of a stop can make a big difference with slides!

  4. #4
    AgX
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    From the curves I've got I deduce that a full CTO is identical in filtration to a 85B (a 1/2 CTO would be a 85C).

  5. #5
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    Hold a ambient meter under the gel then without, and note the difference for your stop compensation.

  6. #6
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    just meter through the gel before you expose, making sure to put the gel back over the lens though, as i inadvertently didn't yesterday, ooops. it'll be alright, slides will be a little bluer than i'd like, but the kodachrome should manage alright

    -dan


  7. #7
    E76
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    Quote Originally Posted by DanielStone View Post
    just meter through the gel before you expose, making sure to put the gel back over the lens though, as i inadvertently didn't yesterday, ooops.
    That's exactly why I don't want to do that.

    Thanks for all the help guys!



 

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