Oh yea... I have tried PMK pyro. It works very well with the large format and medium format. I couldn't come up with satisfactory results with 35mm. Its a bit of a pain to use, but it does deal with the high values very well. To anyone thinking of giving it a try, I think the Gordon Hutchins book is invaluable. Also, get the liquid form of the stuff from Photographers Formulary. Its just so much easier.(posted 8714 days ago)chuck k