I've been playing with this formula for a few years, on and off, refining and tweaking here and there, and now it has become my primary developer for all films and formats. The advantage of superfine grain for small formats is obvious, but the advantages for larger formats might be less so. In short, improved scanning benefits any format that is scanned, and those benefits also apply to optical enlarging. Halcyon produces negatives of very high resolution, with extremely fine grain, but best of all, very fine gradation. TMY-2 developed in Halcyon is a dream combination, but it works well with all the films I've tested. Halcyon gives normal development times and full film speed, but tolerates overexposure better than underexposure. As with all superfine grain developers, there is a risk of dichroic fog, so fresh fix should be used as a preventative measure. Halcyon makes possible high enlargement factors without compromising image quality. While the superfine grain is the most obvious characteristic, it is the total image quality package that makes Halcyon my primary developer. Halcyon DH2O (distilled water) 750ml PPD (paraphenylenediamine) 7g Sodium Sulfite 50g Salycylic acid .5g Ascorbic acid 3.5g DH2O to 1 liter Develop TMY-2 7:30, 70F, IA Halcyon-Replenisher DH2O 750ml PPD 10g Sodium sulfite 50g Salycilic acid .6g Ascorbic acid 5g Triethanolamine 10ml DH2O to 1 liter Replenish by bleed method, 25-50ml/ roll or equivalent PPD is toxic, so use appropriate precautions.