Ilford Film Reciprocity

[Soeren]

And when will the app be out?
Printed the sheet days ago, thumps up to you guys.

 

[Kilgallb]

So Delta 100 and Delta 400 have reciprocity corrections. Why does Kodak TMX which is the same grain structure not have reciprocity corrections.?

 

[Kevin Caulfield]

So Delta 100 and Delta 400 have reciprocity corrections. Why does Kodak TMX which is the same grain structure not have reciprocity corrections.?

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.

 

[dasBlute]

So Delta 100 and Delta 400 have reciprocity corrections. Why does Kodak TMX which is the same grain structure not have reciprocity corrections.?

TMX and TMY both need adjustments for reciprocity. What made you think they didn't?

 

[Wayne]

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.

 

[Vaughn]

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.

 

[MattKing]

So Delta 100 and Delta 400 have reciprocity corrections. Why does Kodak TMX which is the same grain structure not have reciprocity corrections.?

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.

TMX and TMY both need adjustments for reciprocity. What made you think they didn't?

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

 

[sportster44]

Just shoot Acros and be done with it

 

[lpt10]

Thank you !

We have just posted a new factsheet on our website in response to user queries about reciprocity compensation for long exposures. Please go to www.ilfordphoto.com and select "Support" then "Technical Downloads" then "Film".
Or, for instant gratification, go to:
https://www.ilfordphoto.com/wp/wp-content/uploads/2017/06/Reciprocity-Failure-Compensation.pdf

Regards,
David

 

[drpsilver]

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

 

[hoffy]

Just shoot Acros and be done with it

While you can.....

 

[AgX]

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.

 

[Lee L]

The charts currently in all our individual film fact sheets are calculated with the above method using a factor of 1.48. The people who came up with this factor left the company many years ago so I have no idea how it was derived. It was because of our customers questioning this factor that we did the work.

David

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

 

[removedacct1]

Just shoot Acros and be done with it

If Acros was available in 8X10.......

 

[Andrew O'Neill]

Wow Ilford's numbers are very close to mine!