To examine the evolution of the early-type galaxy population in the rich cluster Abell 2390 at z = 0.23 we have gained spectroscopic data of 51 elliptical and lenticular galaxies with MOSCA at the 3.5 m telescope on Calar Alto Observatory .
This investigation spans both a broad range in luminosity ( -19.3 \geq M _ { B } \geq - 22.3 ) and uses a wide field of view of 10 ^ { \prime } \times 10 ^ { \prime } , therefore the environmental dependence of different formation scenarios can be analysed in detail as a function of radius from the cluster centre .
Here we present results on the surface brightness modelling of galaxies where morphological and structural information is available in the F814W filter aboard the Hubble Space Telescope ( HST ) 
and investigate for this subsample the evolution of the Fundamental Plane .