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  1. #1
    aoresteen's Avatar
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    OA safelight For Multigrade Paper?

    Is Kodak OA filter ok for use with Ilford Multigrade IV papers ?

    Thanks!
    Tony
    Newnan, GA

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    http://www.oresteen.com/ROLLEI4X4.htm

  2. #2

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    Probably not a good idea. OA is a greenish-yellow, which probably passes too much green light (Multigrade papers are sensitive to blue and green light). See page 1 in the Ilford link below showing the spectral sensitivity of the paper, and the Kodak link below showing the spectral characteristics of safelight filters (in the graphs which follow the summary, OA is the first graph - and you can see that transmittance extends into the green wavelengths, well below the cut-off suggested by Ilford).

    That being said, no safelight is 100% safe for indefinite amounts of exposure so the best thing to do - always - when you either try a different safelight filter or a new paper, is to conduct a proper safelight tests to determine your safe time. See Kodak and online resources for the proper safelight test procedure.

    http://www.ilfordphoto.com/Webfiles/...6121925810.pdf

    http://www.kodak.com/global/en/profe...845/ti0845.pdf

  3. #3

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    I think all the OA was good for was the old Velox paper. Useless nowadays.

  4. #4

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    In general you have more flexibility with graded papers because they are mostly blue-sensitive rather than blue and green sensitive. OA was also described as being ok with contact papers, but contact papers are typically significantly slower than enlarging papers. So all things considered, variable contrast enlarging papers require the most care in safelighting.

  5. #5
    RalphLambrecht's Avatar
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    Quote Originally Posted by aoresteen View Post
    Is Kodak OA filter ok for use with Ilford Multigrade IV papers ?

    Thanks!
    HERE IS a simple trick to check.take a new or usedCDorDVDwith you into the darkroom.hold it upand bend it slightlyuntil you see a reflection of your safelight in it. bend it enough to break the reflection into a rainbow pattern,similar to using a prism.now,the content of green and blue radiation becomes clearly visible.there should be very little of it,otherwise,switch to a deep red safelight;less comfortable for your eyes,but safer for the paper.
    Regards

    Ralph W. Lambrecht
    www.darkroomagic.comrorrlambrec@ymail.com[/URL]
    www.waybeyondmonochrome.com

  6. #6
    Barry Kirsten's Avatar
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    Kodak no. 13 filter is recommended for VC and panchromatic papers.

  7. #7
    David Brown's Avatar
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    Quote Originally Posted by aoresteen View Post
    Is Kodak OA filter ok for use with Ilford Multigrade IV papers ?
    No. 0C or Ilford 902 http://www.ilfordphoto.com/Webfiles/...1231142522.pdf

    Quote Originally Posted by Barry Kirsten View Post
    Kodak no. 13 filter is recommended for VC and panchromatic papers.
    This is incorrect for VC papers: http://www.kodak.com/global/en/profe...845/ti0845.pdf (page 2)

    Regardless, one should always properly test any safelight setup.

  8. #8
    aoresteen's Avatar
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    Thanks all!
    Tony
    Newnan, GA

    Cambo 23SF, Hasselblad, Mamiya M645, Rolleiflex 2.8C
    Rollei 4x4 Grey
    Leica M4-P M3 IIIf RD Contax IIa Nikon SP
    Olympus OM-1 OM-2

    http://www.oresteen.com/ROLLEI4X4.htm

  9. #9
    fotch's Avatar
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    Quote Originally Posted by Barry Kirsten View Post
    Kodak no. 13 filter is recommended for VC and panchromatic papers.
    The info from Kodak Safelight Data sheet states differently. The #13 is for color negative papers, panchromatic black-and-white papers.

    The OC is for contact and enlarging papers
    Items for sale or trade at www.Camera35.com

  10. #10
    fotch's Avatar
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    Welcome Barry Kirsten to APUG!
    Items for sale or trade at www.Camera35.com

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