> D400 compare to TriX(posted 8340 days ago)I can't answer that one; I haven't used TX in at least 20 years.
In D-76H and Ilfosol-S I find Delta 400's EI 400 rating to be valid with normal development. To be specific, EI 400 in D-76H 1:1 and EI 500 in Ilfosol-S 1:14, but that 1/3 stop difference might just be an error or variation; I ignore it and just shoot at EI 400.
Shadow density and contrast are about the same as HP5+ in those developers, and my results show that new Delta 400 is at least 2/3 stop faster than old Delta 400. Also it doesn't have the decreased red sensitivity that made me dislike old Delta 400.