This EMS-UL SET is specialized for the “D” of 190mm so that it can be used on the Center Mount.  Diameter of the dew-shield of the OTA should be smaller than 190mm. From 10 cm to 15cm of the OTA will be no problem.

中軸架台で10～15cmクラスの鏡筒を使用する前提で、Ｄ＝190mmに設定しています。