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  1. #1

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    IPhone App for Reciprocity failure

    I've written an simple IPhone app that will time Long Exposures accounting for Reciprocity failure. The app contains tables for popular b&w films from manufactures as well as tables graciously provided by Don Kirby, Bruce Barnbaum and Howard Bond. You can also enter your own tables so you can enter your own data or anything you find on the net.

    More info here

    http://itunes.apple.com/us/app/film-...484554296?mt=8

    http://www.davideisenlord.com/?page_id=788

    Ike

  2. #2
    David A. Goldfarb's Avatar
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    Great idea. Downloaded it.

    I think that the column that says "N+.5", "N+1", etc. should be labeled "reciprocity correction" rather than "contrast," since that's what it seems to refer to in this context. I'd also specify for clarity that the tables for "Tri-X Pan" are for "Tri-X 320," since some people may want to use this for Tri-X 400 as well, though I suspect the correction is for all intents and purposes the same.

    Maybe a later version you could add in bellows factor, calculable by various methods, and filter factor, to produce a result with all the relevant components: base exposure + filter factor + bellows factor + reciprocity factor based on the sum of the first three elements.

    Then the real bees knees would be a light meter with Zone system calculations plus all of the above.
    flickr--http://www.flickr.com/photos/davidagoldfarb/
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  3. #3
    JLP
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    Just downloaded it and agree, it is great tool to have. I like to have the timer right there as i rarely cary a watch and therefore need to rely on counting.
    Look forward to see future updates.
    Thanks.
    _______________
    Jan Pedersen
    http://janlpedersen.com

  4. #4
    TBN
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    Android version ??

  5. #5

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    Quote Originally Posted by David A. Goldfarb View Post
    I think that the column that says "N+.5", "N+1", etc. should be labeled "reciprocity correction" rather than "contrast.
    Yeah, its probably not clear, it's the required development compensation so a clearer label might help.

    Thanks for downloading and your good ideas for the future.
    Ike

  6. #6

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    Quote Originally Posted by TBN View Post
    Android version ??
    Sorry, no plans, the development environments, even primary languages, are very different.



 

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