diff --git a/eco/endstations/kappa_conversion.py b/eco/endstations/kappa_conversion.py
index eeac6ab..4c294e6 100644
--- a/eco/endstations/kappa_conversion.py
+++ b/eco/endstations/kappa_conversion.py
@@ -26,9 +26,9 @@ def kappa2you(eta_k, kappa, phi_k, kappa_angle=60, degrees=True, bernina_kappa=T
             [eta_k, kappa, phi_k, kappa_angle]
         )
     if bernina_kappa:    
-        eta_k = eta_k + np.pi / 2 
-        kappa = - kappa
-        phi_k = -phi_k + np.pi / 2 
+        eta_k = -eta_k + np.pi / 2 
+        kappa =  kappa
+        phi_k = -phi_k - np.pi / 2 
     delta_angle = np.arctan(np.tan(kappa / 2) * np.cos(kappa_angle))
     eta = eta_k - delta_angle
     chi = 2 * np.arcsin(np.sin(kappa / 2) * np.sin(kappa_angle))