A relatively uncommon version of the 5cm F2 pre-war Sonnar that has an "adapter" to fit into the rigid mount of the 5cm F1.5 lens.
Held in by one set screw, same as the F1.5 lens.
And the more common collapsible lens, also held in by one set screw- but in a different location.
Once out of the mount, and after the "adapter" is removed- disassembly of the two lenses is identical. Note that the Rigid lens is not just a collapsible Sonnar in the Rigid mount- the name ring is different, close to the F1.5 lens.
The adapter unscrews, the retaining ring is held in by one set screw.
Take out the screw that links the aperture ring to the mechanism, and remove it.
You now see the set screws that hold on the name ring. Take them out, and unscrew the name ring.
The front element and middle triplet lift out, they are in Brass fixtures. Note these and the rear fixture all have the last digits of the Serial Number on them.
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