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Thread: Use of X-ray film: technical discussion with example images

  1. #4941

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    Re: Use of X-ray film: technical discussion with example images

    Years ago you could buy a template for exposing paper to the negative that looked like a pie-chart. It had different segments of separate densities that allowed a certain amount of light through them.
    You used a known time and aperture and shot the paper. You developed the image on the paper/film and used the properly exposed segment you liked as your basis to give you the "perfect" exposure.
    I used the same device to expose X-ray film.
    Just remember to turn off the RED safelight when shooting the image. Also keep the RED safelight at least 5 feet away and never brighter than 5 watts.
    I maintained several hundred darkrooms in my working carrier that processed x-ray film as well as commercial "normal" films. The general rule of thumb is, go into to your dark room and close the door.Turn off the lights.If you have over head florescent lighting allow the tubes to dim out for at least 60 seconds before you open a film bin or film holder ( after-glow). Let your eyes get used to the dark. Look at all door seals and walls.If your eyes can see any white light light,the film can too.
    I simple test you can do is place a piece of x-ray film on your working surface,easel,wet-sink,etc. Place several coins on the film and leave them under your safe light, small light leaks for 60 seconds.Remove the coins and develop the film.If you see circles where the coins sat,your safe light is not safe or you do have a light leak in the room. I could not count the hundreds of times I have found this to be a problem.
    9 out of 10 times it was a too close light or someone had placed a bulb greater than 5 watts into the lamp holder. The filter film was damaged by the heat and pin holes were burned into the filter exposing the film.
    Sorry for the rant, its just that it is so common a problem the user never thinks about it and gets poor results with their images and cannot figure out why?

  2. #4942
    Randy Moe's Avatar
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    Re: Use of X-ray film: technical discussion with example images

    The pie chart is still sold.

    I use one.

  3. #4943

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    Re: Use of X-ray film: technical discussion with example images

    Quote Originally Posted by Randy Moe View Post
    The pie chart is still sold.

    I use one.
    I don't know who makes the current one,the originals were titled, "Kodak Projection Print Scale." I still have a few which I use on a somewhat regular basis in a variety of ways.

  4. #4944
    Randy Moe's Avatar
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    Re: Use of X-ray film: technical discussion with example images

    Freestyle sells it. Now named,

    Delta Projection Print Scale
    Model: 41621
    Manufacturer: Delta

    Not Free but I find it gets me there quicker.


    Quote Originally Posted by Jim Noel View Post
    I don't know who makes the current one,the originals were titled, "Kodak Projection Print Scale." I still have a few which I use on a somewhat regular basis in a variety of ways.

  5. #4945

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    Re: Use of X-ray film: technical discussion with example images

    Microdol X and x-ray film, I just found a couple of tins of the powdered variety, I have never used it, normally just stick to Rodinol, but what the hell a change is as good as a holiday. Said to give a very fine grain, research would suggest 1+3 of stock solution and about 14 min using the rotary method.
    Anybody have any experience with microdol x and x-ray film?

  6. #4946

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    Re: Use of X-ray film: technical discussion with example images

    At 1:3 you will need 15-19 min developing time @ 68 Degrees F. Agitation every 30 seconds. If 1:1, you will need 7-9 minutes. Same agitation, open tray.
    In a container be careful. X-Ray film will pressure streak if agitated too much and it sits by holes or ribs. Treat it in the tank like a too full cup of coffee.

  7. #4947

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    Re: Use of X-ray film: technical discussion with example images

    Thanks Rob

  8. #4948

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    Re: Use of X-ray film: technical discussion with example images

    Click image for larger version. 

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    Here are a couple of shots I took yesterday at an annual car meet, one is slightly out of frame as I was sat in the middle of the road in fear of getting run over.
    One was taken with a Sironar N 135mm, the other with a Kodak Commercial Ektar 8.5 inch. The Commercial Ektar was listed on ebay as just, an Ektar, so I got it fairly reasonably. Its performance is pretty impressive and will see a lot more action from now on. Green xray film 4x5,Rotary developed in R09 10 minutes.
    Last edited by andrewch59; 10-Feb-2018 at 20:54. Reason: more information

  9. #4949

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    Re: Use of X-ray film: technical discussion with example images

    At what guessamation was the ASA? Nice images.

  10. #4950
    alanbutler57's Avatar
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    Re: Use of X-ray film: technical discussion with example images

    Great images! What dilution did you use?

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