Mirror trimmings for EMS-ULS

The material mirror should be trimmed into the appropriate shape to be accommodated in the housing.

 また、(言葉が独り歩きするのが怖いですが)、蒸着後の加工は、バリや傷等のリスクもあります。 そのため、ULS以外のミラーのほとんどは、最終形状のミラーを特注して確保しています。

After the shaping, both rear edges should be ground to evade the collision with the adapter rings.
Currently, all the other type of the EMS have omitted this process because the material mirrors are made for the final shape. Now, you know the reason why EMS-ULS is discontinued.