Testing my 'Gift' RICOH KR-10 Super with outdated 2011 HP5 + a Bad Batch as I used different developers and most were very grainy. D23 was the BEST. Also I tried Camera with PENTAX lenses for some tests.
Nice one, Peter. D23, for a simple developer, it ranks tops for me. I've been working my way through expired 2007 HP5 sheet film, and the base fog is quite high. D23, XTol, seem to work well to minimise base fog.