But if I buy 5L of ID11, and 500ml of fx, and just rinse throughly instead of stop bath and use the ID11 1:1, will I be averaging about 40p to develop a 135mm roll of film?(my dev. tank is 290ml for 35mm). This seems rather cheap! Rather Good!;-) I'm a total beginner in the darkroom, and perhaps may be dev my own films next week, but I'm still doing exams so it may have to wait until June 10.(end of exams). All help appreciated, Rob IRIPN If something's not worth doing, it's worth forgetting about.