I have just started using a Mamiya 7ii and some of the negatives (although with great detail) appear to be slightly lacking in something. I think it is either one of two things. First off my enlarger lens has some fungus growing in it. I have ordered a new lens today. I don't think this is the explanation though. I think it is perhaps a problem of the developer I am using. I have been using Aculux (a fine grain + slight speed enhancing developer). I have been using this with good results in 35mm (generally with TriX and HP5). Now I have moved seriously up the film format stakes I find that this developer produces fine looking negs, but the prints don't look quite sharp enough. The results look OK with Delta 3200 even though I can hardly see any grain at 11x14, but the HP5 I took (and some Acros especially) seem to be a bit soulless. It is difficult to describe in words, but I think it is the edge definition that is not hard enough. It might simply be because I am more used to 35mm with a bit of grain. I understand that aculux would suffer in the sharpness stakes because of its speed enhancing and fine grain. I want to try dilute Perceptol as recommended by Barry Thornton in Edge of Darkness. Ie a developer that still reduces grain, but enhances acutance with a slight loss of speed. Does anyone else have an opinion on this or am I just going mad? Any experiences with other developers also welcome. I fear I may be suffering from the 'search for the elusive magic bullet' syndrome.