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

[Andrew O'Neill]

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

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

[pepeguitarra]

[HoodedOne]

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

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.

[Tin Can]

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

😎

[andrewch59]

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.

[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.

[Jim Noel]

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.

I agree,but have not done exhaustive testing.

[HoodedOne]

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

[andrewch59]

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.

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.

[pepeguitarra]

Here is the data on a graphic: