I've just decided to give Peter Hogan's chemicals a go and wondered if anyone had any experiences of using these with Zone System concepts. It seems from what I have read that altering development times to change contrast will not have the same result as with a non-staining developer. In fact, it seems that as long as the exposure is vaguely OK that you can develop however you want and that the Zone System is effectively redundant! Surely too good to be true! I aim to report back when I have tested but would welcome any experiences of others so far.