Just some info for all Chamonix users who might feel the need to add a bag bellows for wide angle or 6x7 work, the Shen Hao bag bellows for the PTB 45 and TZ45 cameras also fits to Chamonix 45n-1. I've been trying to get hold of a bag bellows from Chamonix but my impatience got the better of me. I took a risk and bought a Shen Hao bellows and sure enough, it fits. Its a little snug on the front format, but the bellows frames, front and back seem to be the same shape as thos of the Chamonix standard bellows.
Thought all you Chamonix users might find this useful.
PS: the widest lens I have is the Schneider 47mm XL and it works fine with the bag bellows if you move the Chamonix rear standard forward an inch or so.