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Thread: Rollei Ortho plus 25 - reciprocity

  1. #1

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    Rollei Ortho plus 25 - reciprocity

    Hello.

    I can not find any data about the reciprocity of this film.

    Because it is low ISO, i think they are necessary for low light conditions.
    I consider to give it a test for reciprocity with a roll of 135 before try the 4x5"
    Another option is to contact Rollei directly?

    Any opinions and experiences are welcome!

  2. #2

    Join Date
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    Re: Rollei Ortho plus 25 - reciprocity

    Quote Originally Posted by Vangelis View Post
    Hello.

    I can not find any data about the reciprocity of this film.

    Because it is low ISO, i think they are necessary for low light conditions.
    I consider to give it a test for reciprocity with a roll of 135 before try the 4x5"
    Another option is to contact Rollei directly?

    Any opinions and experiences are welcome!
    reciprocity with ortho films is heavily dependent on the %age of red in the spectrum of the light being used. If you are thinking of using incandescent light sources for your "low light" exposures, your exposures will be extremely long, even into hours, if the film will expose at all. Check the spectrum with a prism or CD.

  3. #3

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    Feb 2020
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    Greece
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    Re: Rollei Ortho plus 25 - reciprocity

    The use of prism or CD sounds a good idea!Thanks!

    The film i want to use it in the field.
    Mostly for landscapes and architecture.
    Sometimes in deep shadows or a little while after sunset, i think that the exposure will need correction for reciprocity.
    This is my question, to how much correction needs.

  4. #4

    Re: Rollei Ortho plus 25 - reciprocity

    Vangelis, I have searched and found no information whatsoever about reciprocity characteristics of this film. It seems most users have adopted reciprocity correction rates for slow Rollei films like RPX 25 and finding that is close enough.

  5. #5

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    Feb 2020
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    Re: Rollei Ortho plus 25 - reciprocity

    Thanks paulbarden,

    I will try a roll first, with the correction suggested by Rollei in the RPX 25 datasheet.

    I will post my results soon!

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