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

  1. #5441

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

    What base-fog is considered acceptable?

  2. #5442
    David Schaller
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    Re: Use of X-ray film: technical discussion with example images

    Quote Originally Posted by koraks View Post
    Check your safelight; this may just be optical fogging of the film.
    Thanks Koraks, I will try the next one in the dark.

  3. #5443

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

    Good luck. I've had a fair sharw of safelight fogging qith xray film myself. Most red leds are not safe enough due to a secondary emission peak in the green part of the spectrum. A dim red led with an additional red filter fashioned out of a sheet of rubylith film works very well in my experience.

  4. #5444

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

    I followed Jason Lane's lead, and made a safelight with red LED bulb, and the deep red Kodak Ortho filter.

    I have some of his Speed 25 Glass Plates, they can fog, unlike his ISO 2 plates. Also should work well for XRay.

    I have 8x10 Fuji green two-sided, and four new 8x10 Cesco trays from B&H, so we will see. Rodinal 1:100 looks promising with very minimal agitation.

    Looking forward to dusting off the 8x10 Norma.
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  5. #5445
    Peter De Smidt's Avatar
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    Re: Use of X-ray film: technical discussion with example images

    Well, I developed my Extascan in my Jobo....but I might have loaded it under red safelight. Thanks for the tip!
    “You often feel tired, not because you've done too much, but because you've done too little of what sparks a light in you.”
    ― Alexander Den Heijer, Nothing You Don't Already Know

  6. #5446
    David Schaller
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    Re: Use of X-ray film: technical discussion with example images

    I spent most of the day solving my computer problems, but after I did, I developed the second negative with several changes in my method.
    1. Developed completely in the dark, as I have done with regular film, so no red safelight.
    2. Presoaked with agitation for 4 minutes.
    3. A more dilute Pyrocat, 15/15/2250 (1/1/150), for 8 minutes, with agitation the first minute, and for 10 seconds every minute thereafter.
    Negative is drying now, and I should be able to scan tonight.
    Thanks for your help.
    Dave

  7. #5447
    jp's Avatar
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    Re: Use of X-ray film: technical discussion with example images

    I have red LEDs from superbrightleds.com or something like that and if I leave them on the whole time while developing I will get some fogging. It does not seem to create notable fog if I use the LEDs for loading/unloading the film which is generally less than a minute. Also try more liquid in the tray for pyrocat developing.

  8. #5448
    David Schaller
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    Re: Use of X-ray film: technical discussion with example images

    Thanks Jason. That LED might have been the culprit. I don’t mind loading and unloading in the dark

  9. #5449
    David Schaller
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    Re: Use of X-ray film: technical discussion with example images

    Of course this was a flat-light-on-snow day, so it looks a bit smudged, and I didn’t spot the dust, but I’d say the original problem was the safe light. I will try to shoot some more this weekend, indoors and out.
    Thanks again for all the input.
    Dave

  10. #5450
    Peter De Smidt's Avatar
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    Re: Use of X-ray film: technical discussion with example images

    Looking good! I stopped using it because I got some unusable 8x10 negatives, and my 8x10 photography time is valuable. I'll give it another go.
    “You often feel tired, not because you've done too much, but because you've done too little of what sparks a light in you.”
    ― Alexander Den Heijer, Nothing You Don't Already Know

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