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  1. #1

    Join Date
    Oct 2012
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    20x24" negative MM size

    i am in the intersting, challengly process of making a new 20x24" camera.
    all the theory has been adapted into a working model of the set up.

    next step is to make a carrier for the negative/glass plate.

    i need the actual size of a 20"x24" negative in millimeters please.
    it appeares that a 4x5 negative is slightly smaller than the exact convertion to mm.
    it actually measures 100x125 mm, that means that 1" = 25 mm in filmsizes.
    (the official conv. is 1"= 25,4mm)
    will that be the case in 20x24" neg.??

    needless to say, but i am looking for a useable lens for the beast,
    allthough it seems that the front element of a 300 mm symmar will fill the groundglass in full,
    even near portrait distance. but practice will show.
    anyone with practical experience here?

    klaus
    denmark

  2. #2
    ic-racer's Avatar
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    Feb 2007
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    Midwest USA
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    I don't think there ever was an ANSI standard for that size. Maybe ask Ilford (or whoever is going to supply your film) how big they cut it.

  3. #3

    Join Date
    Oct 2012
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    thanks ice racer,
    i am in contact with a Chinese company who can cut x-ray into any size.
    i thought it would be of interest to others with a filmholder for 20x24.
    i do not yet have the prices, all depends on how many i order of course, but it is a small company with few employies, i think they are quite flexible in the production.
    the dont have b&w film, sorry.
    i will order 50x60 cm that is european standard.
    klaus

  4. #4

    Join Date
    Dec 2006
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    Hello I will use my first 20x24 ilford HP5 sheet film on saturday. I will so be abble to tell you what is the exact size this Week End if you still want to know.
    X-ray film could interest me depending on the price, but of course with the right size...
    Thierry M.L.

  5. #5
    wildbill's Avatar
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    Nov 2004
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    Grand Rapids
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    A 300mm symmar won't cover this format and would also be a very wide field of view.
    www.vinnywalsh.com

    I know what I want but I just don't know how to go about gettin' it.-Hendrix



 

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