Heh, heh. Carolly, my darkroom has worse things than multiple doors. If you're not careful, you might fall down the toilet when the seat's up! Or develop a bar of soap by accident. LOL. At one point, I was planning to make a futuristic house with irised doors, but I never got started on it. (It's one of those 'filed-for future-use' projects). But the idea of trying to ERC an irising diaphragm is frightening. At least I've got my nikon to use as a model for it. mac