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Ilford Film Reciprocity

And when will the app be out?
Printed the sheet days ago, thumps up to you guys.
 
So Delta 100 and Delta 400 have reciprocity corrections. Why does Kodak TMX which is the same grain structure not have reciprocity corrections.?
 
Kilgallb said:
So Delta 100 and Delta 400 have reciprocity corrections. Why does Kodak TMX which is the same grain structure not have reciprocity corrections.?
Click to expand...
Maybe ask Kodak or Alaris or whoever speaks for them these days. They haven't even been upfront about their serious backing paper issues, so good luck trying to find out about reciprocity.
 
Not everyone carries a calculator in the field. I can certainly make a table for the films I use but a graph or table for each film might have been a more immediately useful format for this info.
 
Since I like negatives that have a DR of around 3, I use reciprocity failure to increase contrast...very handy.

Any single factor applied to correct for reciprocity failure will be an approximation and will need to be tested and refined. Type of scene, quality of light, SBR, developer, what one wants the image to look like, and all come into play.
 
Kilgallb said:
So Delta 100 and Delta 400 have reciprocity corrections. Why does Kodak TMX which is the same grain structure not have reciprocity corrections.?
Click to expand...

Kevin Caulfield said:
Maybe ask Kodak or Alaris or whoever speaks for them these days. They haven't even been upfront about their serious backing paper issues, so good luck trying to find out about reciprocity.
Click to expand...

dasBlute said:
TMX and TMY both need adjustments for reciprocity. What made you think they didn't?
Click to expand...
If all else fails, you can always try the instructions (see page two of the Kodak data sheet found on Kodak Alaris' website): http://imaging.kodakalaris.com/sites/prod/files/files/products/f4016_TMax_100.pdf
 
04 Sept 2017

David:

This will be really useful for some my low light photography. Thank you very much for this useful tool.

Regards,
Darwin
 
Important:

the formula needs input in seconds (input in minutes yields wrong results)

Seconds are stated in that manual, but not stressed, thus such might be overlooked.
 
I have a table from a 1970's Ansel Adams workshop that was passed along to me in 1978. At that time Kodak was using a generic factor of 1.49 for all their B&W films. This must have been common practice in the 60's and 70's.

Thanks very much for doing the work and publishing it.

Lee
 
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