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

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Originally Posted by Andrew O'Neill

Well, I've used it all the time for long exposures. The fastest shutter speed for me was one second... still need compensation. Very poor reciprocity. Randy linked to my data that I've been using successfully for many years in the field. :)

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I have referred Pepe to you as a source concerning reciprocity.

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Originally Posted by Jim Noel

I have referred Pepe to you as a source concerning reciprocity.

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So that explains all the people knocking at my door at all hours! ;)

:o :confused:

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Originally Posted by pepeguitarra

I have not read the 532 pages, so, can anyone tell me how you deal with reciprocity with X-ray film. Thanks, Pepe.

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I’m only using 8x10 x-ray film with a pinhole camera. So, exposure times range from 1 second to 16 minutes. I can give you the reciprocity data I have, although I don’t know how I got those.

Post for all for all us please

Recip will depend on light source as some have posted

Strobes vary, flashbulbs vary

Time of day daylight is A variable

LED color temp varies

Every variable varies

Testing methods vary

Some just lie. A photographer technique down the ages to protect their advantage

Misdirection is common

ymmv

😎

http://www.bwvision.com/complete-gui...-2016-edition/
I have found the timings in here pretty spot-on, as long as you are using nd filters of course.

That article assumes a full digital work flow and hence doesn't give useful insights into reciprocity issues as present in ilm capture.

FWIW, with Ektascan BR/A I don't notice any reciprocity issues at least up to 15-30 second exposures.

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Originally Posted by koraks

That article assumes a full digital work flow and hence doesn't give useful insights into reciprocity issues as present in ilm capture.

FWIW, with Ektascan BR/A I don't notice any reciprocity issues at least up to 15-30 second exposures.

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I agree,but have not done exhaustive testing.

This is the reciprocity data I use for x-ray film (e.i. 50)

(Everything in seconds)
1 = 1.3
2 = 2.8
4 = 6
6 = 9
8 = 13
11 = 19
16 = 29
23 = 44
32 = 67
45 = 98
64 = 176
91 = 285
128 = 514
181 = 1224
256 = 2228
362 = 5940

Quote:

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Originally Posted by koraks

That article assumes a full digital work flow and hence doesn't give useful insights into reciprocity issues as present in ilm capture.

FWIW, with Ektascan BR/A I don't notice any reciprocity issues at least up to 15-30 second exposures.

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Actually it does, by chance or not I Have the exposure chart and use it regularly, that plus the fudge factor given for reciprocity work very well in my experience.
It also shows images created by Micheal Kenna, an ANALOGUE photographer.