Mike, I've used Tech Pan @ ISO 50 in Photographer's Formulary TD-3 developer with very satisfying results. Mix as per instructions and use 100ml A + 100ml B + 800ml distilled water; develop for 14 minutes, agitating for one minute at the start (1 inversion/2 sec), then 10 sec/min, thereafter. If you find you want even less contrast, reduce the "B" solution to 50ml and develop for about 18 minutes.(posted 8515 days ago)Incidentally, this developer is based on catechol and so if you are unable to find TD-3 developer (you can order it directly from their website), you can make your own easily enough. I don't have my reference materials handy, but if you start with 5g catechol + 20g sodium sulfite in 1000ml for A, and 100g / 1000ml of potassium carbonate, you'll be pretty close to their formula. Catechol has wonderful compensating properties, and is ideal for Tech Pan. Ted Kaufman