Most monorail system cameras will allow interchangeable bag bellows for optimal movements using short lenses. The Sinar cameras are the most common type. I chatted with Mark one day when he was using the Toyo monorail here, but no difference in principle. Technikardans have a collapsing or telescoping rail which would seem more difficult to balance at the extremes, so it would be scratched off any hypothetical list of my own of ideal architectural cameras. With most monorails you can simply add or remove sections to accommodate a very wide range of focal lengths. Some people like the greater portability of those little Ebony non-folders, but you sacrifice the potential for using longer lenses unless you buy a relatively expensive optional extended back. The quality of Ebony is certainly excellent, but you pay for it.