This plate corrects the offset between the center of the mirror reflecting surface of the kinematic mirror holder (MHG) and the mounting position of the holder.
Using a rod shift plate increases the optical axis height by 10 mm.
(MHG-12, 7BPRO only 12.3 mm)
The rod shift plate can be fixed to the stage or base plate with M4 screws in addition to the M6 screws.
When a 5 mm thick mirror is used for the holder, the mounting center and the mirror reflecting surface center coincide.
If you use a mirror with a thickness other than 5 mm, the offset amount remains.