Orwo NP55 - sensivity

Discussion in 'B&W: Film, Paper, Chemistry' started by thevenin, Aug 19, 2008.

  1. thevenin

    thevenin Member

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    Hello!

    What is the nominal sensitivity of the NP55 film?
    (It's a 35mm B&W, cinematographic film manufactured by Orwo)

    Adam.
     
  2. AgX

    AgX Member

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    Welcome to Apug Adam.

    Concerning your question: I could not find any data in my archive. However a reasoned guess would be that 55 would be sensitivity in GOST (later films had the DIN-sinsitivity in their name). Thus about 18DIN.
     
  3. thevenin

    thevenin Member

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    Hello,

    Thank you for reply,

     
  4. argus

    argus Member

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  5. AgX

    AgX Member

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    Why the guess with soviet units? Because the Filmfabrik Wolfen was a soviet company from 1945 until 1953.

    Actually I thought the NP55 was a quite old film, but meanwhile I learned that it was intended as film for shooting TV features...
     
    Last edited by a moderator: Aug 20, 2008
  6. MartinB

    MartinB Member

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    maybe 22DIN

    I have never used the film but a Google search turned up a
    Czech post suggesting 22DIN/125 ASA. I used Google translator since I can't read Czech.
    Hope this helps.

    Czech ref to Orwo NP 55
     
  7. Kino

    Kino Member

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  8. thevenin

    thevenin Member

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    Thanks guys!


     
  9. MartinB

    MartinB Member

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    Adam,

    Looking forward to the results, it sounds like you have enough film for some experiments.

    Since you are new to APUG, you may not have seen previous posts on testing film. You should search through the posts in the B&W forum and you should find all kinds of good information. The stand/minimal agitation technique with dilute 1:100 Rodinal can be useful when you are not sure about exposure.

    The 50-125 ASA/ISO you have found on the Czech and Polish sites are within the normal range found with most film. For example, you will find APUG users who expose Ilford FP4+ (nominally 125 ISO) anywhere from 64-250 ISO and adjust their developer and processing time to suit. I expect you will find useful exposures with the ORWO anywhere from 50-125. Probably the 50 ISO will require a little underdevelopment and slightly lower contrast whereas the 125 requires more development (longer) and results in slightly higher contrast. The Czech site seemed to have some suggestions for a starting dilution/time for Rodinal. (I would suggest the 1:50 dilution as I have found 1:25 for other films requires more precision in nailing the time and agitation)

    Also the massive development chart at Orwo on Digital Truth has info on some Orwo films (NP22 but not NP55) that may be helpful. (This link is buried in the notes section of the chart, not off the main pick list)

    by the way, welcome to APUG, from western Canada!

    Martin
     
  10. thevenin

    thevenin Member

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    Martin, thanks for reply.

    Yes, I'm new to Apug, but I'm not novice to B&W processing ;-). Here, I'm interested only in NOMINAL sensitivity
    (manufacturer's data, I don't even ask about e.g. characteristic curves...) Of course ACTUAL sens. will be different. Fortunately metal cans were frozen and originally sealed but stickers with information are completly unreadable. The estimation of "optimal" processing parameters will be necessary, I agree. I'll start with 0.5m specimens next week.
    Adam.
     
    Last edited by a moderator: Aug 20, 2008