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  1. #1
    smithdoor's Avatar
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    Film developing slide ruler

    Film developing slide ruler

    Here is one way of getting the developing time works great
    A simple slide ruler for developing

    All you need is the time and temperature an 68F/20C of the film and developer slide the ruler to that location. Then just take the temperature of your developer and find on the slide ruler and there is the time you need for your film.

    Dave
    Attached Thumbnails Attached Thumbnails slide-ruler-for-film.jpg  

  2. #2

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    Interesting. Would this work with any developer....I'm wondering whether the activity of all developing agents varies in the same way with temperature ?

  3. #3
    smithdoor's Avatar
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    It works great with D76 this the only developer I have but I have try with others from the charts and does work

    Dave

    Quote Originally Posted by railwayman3 View Post
    Interesting. Would this work with any developer....I'm wondering whether the activity of all developing agents varies in the same way with temperature ?

  4. #4

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    Thanks. Here's a chart from Kodak that will help (features different developers too) if you don't have a slide rule, something which I do not have. It's in PDF form, so you can print it out or just save it to your computer.

    http://www.kodak.com/global/en/profe...4017/f4017.pdf

  5. #5

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    An interesting gadget and in a way more analogue than a table I note that it indicates that a higher temp = higher contrast. Is this the case. I always assumed that more agitation or longer dev time at a constant temp gave higher contrast but temp by itself didn't

    pentaxuser

  6. #6
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    Hey Dave,
    Where'd you get this slide rule?
    Last edited by oldlincoln; 02-20-2014 at 11:29 AM. Click to view previous post history. Reason: spelling

  7. #7
    smithdoor's Avatar
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    Made the slide rule
    Here is the print out

    Dave

    Quote Originally Posted by oldlincoln View Post
    Hey Dave,
    Where'd you get this slide rule?
    Attached Files

  8. #8
    RalphLambrecht's Avatar
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    what a great idea!
    Regards

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

  9. #9

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    This is excellent, was considering attempting something similar, but my efforts would not have held a candle to this.

    Your file has been printed, cut and glued to bits of card - my new slide rule may just replace the tedious tables, graphs, electronic calculator and could take some load off the Massive Dev app. Have marked off the +15% points for the two partial exhaustion tiers of Xtol (can't resist 'hacking' it).

    I am impressed.

  10. #10
    Marvin's Avatar
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    I still have my Cook Radio Slide Rule from the 60s.

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