Mytery Zeiss Sonnar 2,8/85

[nb11811]

Can anyone help me identify this lens? I bought a box of mostly enlarger lenses in preparation for opening a community darkroom, and this zeiss 85 was laying in it. It has no movable rings and an internally controlled aperture, I’m unfamiliar with the mount and would love some help

 

[chriscrawfordphoto]

Contarex

 

[nb11811]

Is the focus built in to the camera too, I‘m struggling to understand how this would work with no bellows? The lens has no focus ring.

 

[markjwyatt]

Contaflex 126

Carl Zeiss Sonnar 85mm F2.8 Contaflex 126

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There is also the Weber SL75 prototype which used a modified Contarex mount: https://en.wikipedia.org/wiki/Contaflex_SLR#The_Weber_SL75