I have the chart for Ilford films, would any of the members here be kind enough to contribute their filter factors for films other than those made by Ilford. Thank you in advance.
I have the chart for Ilford films, would any of the members here be kind enough to contribute their filter factors for films other than those made by Ilford. Thank you in advance.
Why don't you post the ones you have for Ilford?
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Ilford reciprocity compensation factors (I think this is what OP means, and he wants equivalent info for other brands):
https://www.ilfordphoto.com/wp/wp-co...mpensation.pdf
Trivia: I am responsible for Ilford having gone through this exercise I was not as successful with Kodak unfortunately.
If you use iOS, the app Reciprocity Timer is US$1.99. There are in-app purchases, but the additional functions aren't necessary if all one wants is reciprocity failure.
Flickr Home Page: https://www.flickr.com/photos/alanklein2000/albums
Here's Howard Bond's article. https://www.willwilson.com/articles/...ciprocity2.pdf
Some of the results are likely outdated, but methodology, etc. are still valid.
You can use these as starting times for Kodak materials (I find they are close with TMY and 320Tri-X out to 20+ minutes).
For Ilford, use the data that Michael R links to and make yourself a chart.
Best,
Doremus
Don't apply reciprocity exposure and development corrections for long exposures (1/2 sec. +) based on published data. Test for yourself after you have experimentally determined exposure and development schemes and you may be surprised. I wasted a lot of time and effort producing long exposure negatives that were thick and flat. When I finally tested, I found no compensation was required for TXP or now HP5+ out to one minute.
The longer the exposure, the less important the exact time is.
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