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The Master is a 4x5inch monorail camera made by the Dutch company Cambo. It was introduced in 1988. It is almost similar to the Legend. Plus variants of both were delivered assembled ready-to-use in a suitcase.
What is different to the Legend are its not U-shaped but L-shaped frame. The tracks are Teflon filled to reduce friction.
The Master Plus , also introduced in 1988, added the feature of variable axis tilts which avoids re-focusing in many cases.