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Thread: Determining reciprocity failure experimentally?

  1. #1

    Determining reciprocity failure experimentally?

    I've been thinking about doing this for the x-ray film I'm using. Is there any standard procedure for this? I was thinking of taking a bunch of gradated exposures in a low-light setting. Against what frame of reference would I compare the results, though? This is the part I'm not clear on, given that there's no easy way outside of using a densitometer and the spec sheet, the former of which I don't possess.

  2. #2

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    Re: Determining reciprocity failure experimentally?

    easy way - https://www.photrio.com/forum/thread...-effect.62519/. You could probably reach out to Andrew for his advice.

    DIY Way
    use a step wedge in front of your 4x5 film, Take several shots at different f-stops keeping time same, measure densities and see how far off a certain tone drifts. IF linear it will change 1 stop, but probably not and your plot will show it to you. You could also do it under an enlarger as a contact stepwedge to film print, raising the light and using neutral density filters for longer exposure times. Proccess all your film together so there is no variance in development.
    Adventure is worthwhile in itself. ... Never interrupt someone doing what you said couldn't be done. -- Amelia Earhart
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