The formulae and acutance with AH-15,16,17,18 are given at the end here by Gudzinowicz:
They were OK with Panatomic X, not with Tri-X.
I tried AH-18 about 5 years ago.It's like FX-1 or Beutler with lower pH and longer time.I think your formula is AH-18.
I did not try the AH-15 version.
Years ago they used to develop films in acutance developer to make the prints look sharper.
Crawley called this "The acutance era".
This type of film that gave strong acutance effect is not made anymore,eg, Panatomic-X, Plus-X,Adox CHS-25,50,100.
Modern films with tabular grain show much less response to acutance developer,but have finer grain.
Last edited by Alan Johnson; 11-03-2012 at 05:20 PM. Click to view previous post history.