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

  1. #4601

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

    Barry The sheet of glass placed in a 8x10 tray eliminated three dense lines in a traditional tray, no scratches and I rock the tray side to side then switch to rocking end to end.
    The film does not stick to the glass,as a aid to pick up the film I cut all corners at 45deg which enable quite easy removing the neg from the developer.
    I use Fuji HRT 1:100 rodinal as a developer.
    I have been testing some Kodak R-Min x-Ray and this develops quite nicely in Rodinal 1:100 and LC 29 13mm +1000 which is giving a slightly denser neg Dev times 6-8 Minutes
    Bazz with a Croweaters greeting

  2. #4602

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

    Click image for larger version. 

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    A few years ago I bought some Ektascan BR/A X-ray film for my 8x10 camera. The film was a little slow for my needs so I didn't end up shooting too much, but looking back at images I took years ago I am wondering what caused these lines in the photo attached. I did a pre-soak and then tray developed in HC110 1:31 but forgot what development times I used.

    Could these lines be caused from too strong of a developer dilution + short development time? I'm wondering if I should have used a more diluted developer to prolong to development time in hopes of a more evenly developed negative with less density.


    Any thoughts or suggestion is much appreciated!


    BTW, has Ektascan BR/A 8x10 gone up in price over the past 2 years?

  3. #4603

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

    You mean the extra density along the lower edge and in the top left corner? That looks like a light leak or a non-safe darkroom light. Local overdevelopment mat play a role as well, but it mostly looks like fogging.

  4. #4604

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

    I'm mainly talking about the lines seen across the middle of the image. Best seen on the dress



    The fogging was taken care of.


    edit/ added crop photo
    Attached Thumbnails Attached Thumbnails TaraXray_rescancrop.jpg  
    Last edited by axs810; 30-Jan-2017 at 01:45. Reason: added crop photo

  5. #4605

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

    It's really very hard to see what you mean, but I think I can see it. It looks more like mottling than like straight lines, can this be the case? If so, it would suggest uneven development.

  6. #4606

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

    For me this "lines" show the same structures (grass, trees) as in the negative themselves , but with a shift to the right side, somehow looking like a double exposure - and I have no idea why.

  7. #4607
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    Re: Use of X-ray film: technical discussion with example images

    Quote Originally Posted by seezee View Post
    Many of those on this thread, including myself, had had good luck with this lamp. This base allows you to double your output when used with a standard spring-clip shop light. As long as you point the fixture toward the ceiling or walls, away from your trays, you shouldn't fog film. It's okay to shine directly for a short time for inspection. I have left film sitting in trays for an hour under those conditions with no noticeable harm.
    I have used that exact bulb with great results, however, be warned that the globe is held on with hot-melt glue. If you screw it into a socket that is still warm from a different bulb, the globe falls off. Mine still works fine without a globe, but might be dangerous, but I still use it. It's very bright and safe.
    Science is what we understand well enough to explain to a computer. Art is everything else we do.
    --A=B by Petkovšek et. al.

  8. #4608

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

    On the first example you show it is definitely a light leak. With my old wooden film holders I would get the same kind of result, probably the same reason for the light left side. For my 10x12 I had a big light tight sock made to cover the entire holder. I put the film holder straight into the sock and then slide it into the back of my vageeswari with the sock still on. no light leaks! With the normal regal type 4x5 holders I have taken up the practice of covering the slit the septum comes out of with a light tight material to prevent light entering

  9. #4609

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

    Yes the light leaks were an obvious problem which I fixed shortly after. The thing I am confused about is the artifacts that look like flickering luminosity similar to what you would see with CFL bulbs or CRT tv. I'm assuming it's a development problem since I was using HC110 dil B (dev time I forgot)


    Not sure if it was because my tray is slightly bigger than 8x10...maybe I need to use an 11x14 tray? Or could it have been from just developing it like normal film and not using a sheet of glass in the tray? Maybe the dilution was too strong and my dev time was too short? I don't know about the last one but I'm not ruling it out. I was using the same LED bulb from superbrightled and bounced it off the ceiling so I doubt it was the safelight. I did do a pre-soak before development...not sure if that has any effect on ektascan br/a film.


    If you look at the second photo I posted. Her hip area and mid thigh show the darker "banding" and then the top left tree branch shows the luminosity banding too.

  10. #4610
    Barry Kirsten's Avatar
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    Re: Use of X-ray film: technical discussion with example images

    Hi Bazz, thanks for that. I think in the interim I'll go with the glass plate, as scratching is intolerable. I've always developed all my sheet film in trays, but spurred on by this experience I'm looking into making a tank and hanger system for the 5x12 x-ray film I'm using, using acrylic sheeting - something like the Combi Plan system. If it works out I might build something for other formats. I'm not thinking of making it daylight capable, as I'm quite happy developing in darkness of under safelight. Keep you posted. Cheers.

    Quote Originally Posted by Bazz8 View Post
    Barry The sheet of glass placed in a 8x10 tray eliminated three dense lines in a traditional tray, no scratches and I rock the tray side to side then switch to rocking end to end.
    The film does not stick to the glass,as a aid to pick up the film I cut all corners at 45deg which enable quite easy removing the neg from the developer.
    I use Fuji HRT 1:100 rodinal as a developer.
    I have been testing some Kodak R-Min x-Ray and this develops quite nicely in Rodinal 1:100 and LC 29 13mm +1000 which is giving a slightly denser neg Dev times 6-8 Minutes
    Bazz with a Croweaters greeting

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