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Thread: Reciprocity Timer 1.0

  1. #1

    Join Date
    Feb 2011
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    Reciprocity Timer 1.0

    Hi All. I have just had Apple accept my first iPhone App into the store! It is a simple little app I originally made for my own use that I thought others might also get some value from.

    It allows you to select from a list of available films and a metered exposure duration - from there it will calculate an actual exposure including reciprocity. The maths is based on as many formaulas I could find for some common films. You can currently select from Ilford B+W, Velvia (color filtered and unfiltered), Provia, Tri-X and Ektar. I will be more than happy to add new films if anyone has the mathematics and can send it to me.

    The app also includes a slider to let you add or remove stops of initial exposure (for example if you add an ND) and gives you a count-down timer to time-out your shutter.

    It's pretty simple - but I have found it really useful.These shots were made using it.

    I have it listed at $1.99 - but will obviously review that depending on feedback and workload.

    You can get it here.

  2. #2

    Join Date
    Jun 2008
    Location
    Melbourne, Australia
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    432

    Re: Reciprocity Timer 1.0

    Been hoping for something like this, will download and give it a try.

  3. #3

    Join Date
    Sep 2007
    Location
    Stevens Point, WI
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    1,534

    Re: Reciprocity Timer 1.0

    It would be useful to know all of the films included.

  4. #4

    Join Date
    Feb 2011
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    Re: Reciprocity Timer 1.0

    The included films are listed in my post. I am also happy to add new films as the maths comes to hand!

  5. #5

    Join Date
    Sep 2007
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    Stevens Point, WI
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    1,534

    Re: Reciprocity Timer 1.0

    OK. I did not notice that. What I should have said is that I wish it had TMY2!

  6. #6

    Join Date
    Feb 2011
    Location
    Brisbane, Australia
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    279

    Re: Reciprocity Timer 1.0

    Have you got a chart of times? I can try to calculate a best fit formula for it and add it if you have. If you have some useful data for other films just pm me!

  7. #7
    Director @ Images Argentiques sultanofcognac's Avatar
    Join Date
    Nov 2007
    Location
    France (and Switzerland)
    Posts
    145

    Re: Reciprocity Timer 1.0

    Just downloaded it – looks very interesting and will put it to the test this weekend ;-)

    How about Acros 100 and Efke films?

    Good luck in the future and thanks for what looks like a good tool!
    Are we truly creative, or simply too lethargic to become pedestrian?

  8. #8

    Join Date
    Dec 2009
    Location
    Saratoga Springs, NY, USA
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    755

    Re: Reciprocity Timer 1.0

    tmax 100 and 400; Efke 25 and 100; Acros 100 are those I use the most. Looks good.
    David Aimone Photography
    Critiques always welcome...

  9. #9
    Do or do not. There is no try.
    Join Date
    Jan 2007
    Location
    Massachusetts, USA
    Posts
    734

    Re: Reciprocity Timer 1.0

    Nice-looking and useful app, well done.

    Is there any value in some sort of zoom function on the filter slider to trade less range for finer resolution, like 1/2 or 1/3 stop? I don't use filters that need 9 stops of compensation, but usually use 1-1/3 stop for my polarizer. So maybe the full +-9 stop range in 1-stop steps as now, and a second with +-3 stop range in 1/3 stops???

  10. #10
    Light Guru's Avatar
    Join Date
    Jun 2011
    Location
    Salt Lake City, UT
    Posts
    604

    Re: Reciprocity Timer 1.0

    Any chance of adding Velvia 100?

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