Abstract: The described joint (1, 3, 2) consists of at least three joint parts preferably with different material composition and thus different thermal expansion coefficients .alpha.. For optimum compensation of the deformation differences acting predominantly radially, which result with a temperature change, it is proposed to provide between a first joint part--for example an optical lens (1)--and a second joint part--for example a lens mounting (2)--at least one further joint part as intermediate ring (3), the ring thickness-dimensioning thereof and the material selection thereof (thermal expansion coefficient .alpha..sub.R) being carried out in such a manner that the aforementioned deformation phenomena, which are material-specific and caused by temperature change, in the joint (1, 3, 2) compensate themselves in such a manner that a stress-free or low-stress mounting, for example of microoptics (1) for use in polarization-optical instruments, can be realized.