Color temperature & cc filters

Discussion in 'Large Format' started by vick_vickery, Feb 10, 2005.

  1. A while back I picked up a set of CC filters and a color temperature
    meter and have been searching everywhere for a chart showing what
    filter/pack to use for converting a given color temperature to the
    5500 degrees used by most color daylight films. Anybody know where I
    can find one? The best I've done so far is a chart of the 80-series
    and the temperature they convert to 5500 along with a chart of the cc
    filter pack equivilant for the 80-series.
     
  2. sir, i was under the impression that the minolta colormeter has a function to let you know which cc filter is needed. its been awhile, but, how about the minolta website?
     
  3. Kodak Professional Dataguide has a computer wheel for this. I don't know if it's in the currently published equivalent, but it's easy to find on eBay dirt cheap.
     
  4. However, in said book, Kodak does not recommend using CC filters to do color correction. Yes, a stack of them can do the job, and they even give some of the stacks, but you will lose more light than you will with the correct 81, 82, and 85 series filters.
     
  5. CC filters were more used to correct very minor color variance where critical color reporduction is required.

    Early in my career each box of ektachrome has a set of cc value and exposure factor. your strob lights would also be tested to the 5500K color separation standard using guides and charts.

    This is to ensure accurate color reproduction in catalogs and magazine ads.

    To correct for major differences daylight, tungsten you should use the 8x series.
     
  6. Backk to the original question .. Vick .. what sort of color temperature meter are you using
    .... all of the current crop will give you the readings you need. OTOH earlier ones, will not
    necessarily do so and most of them were not three color meters either.
     
  7. Vick, I have an article on my web site where I discuss the basics of color temperature meters and decamired filters for in-camera color correction. I don't specifically talk of CC filters (I'm a big user of DM), but you may find some of the info useful. It's located here.
     
  8. Thanks for all the responces. The meter (given to me by a retired photographer friend) is an old Gossen Sixticolor; I realize it has its limitations, but it has been interesting to see that it gives readings that are very close to what various sources have given as the typical color temperatures of various known lighting sources that I have been able to meter. Should be useful info when selecting filters.

    I just ran across a list of filter packs that approximate the 80-series in cc filters. Here is a list for those who might be interested:

    80A = 90C + 30M (+2 stop)
    80B = 80C + 25M (+1 2/3 stop)
    80C = 55C + 17M (+1 stop)
    80D = 35C + 12M (+2/3 stop)

    A much more complete list is available at:

    www.geocities.com/thombell/colling.html?200510
    and
    www.geocities.com/thombell/warming.html?200510
     
  9. I'm not sure if there is a way to make a direct comparison/conversion of CC to DM filters. DM filters are designed to impart a specific mired shift value regardless of the color temperature of the light source involved. I'm not so sure if that's possible with CC filters.
     
  10. I think it should be www.geocities.com/thombell/cooling.html and /warming.html ...

    I'd recommend taking the numbers at that page with a grain of salt; for example, when I work it out for a #81D I get 21Y+11M.
     
  11. Hmmmmm...Chris, could you comment on how you "worked out" the equivilant pack for the 81D filter? This might prove to be just what I was looking for. Thanks for the site address correction, too; I'm not too swift on computers, just copied what printed out on the bottom of my hard copy.
     

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