Patrick, as one can see on the first page http://www.schneideroptics.de/archiv/pdf/m_componon.pdf
the M-Componon in the background is mounted in a shutter size #0. So the shutter is used as a back-shutter. To use the same shutter with another M-Componon, only unscrew the whole lens and screw the other lens in. It's the same as with switching between different enlarging lenses.
With the three small screws loosened, not removed, you can turn the lens in the mounting ring to avoid the f-scale is at the wrong side so you can read the f-scale
effortless. If the whole lens is turned in such a position, fix the screws.
Peter K
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