Note the spacing ring on top of the first unit for the D of 180mm.(The standard “D” is 160mm.)
Another EMS-UL SET for Germany in the making
MATSUMOTO-EMS | 天体望遠鏡革命
Innovation of Astronomical Telescope
正立ミラーシステム（EMS）を開発した松本龍郎のサイト。 たった２回の反射で天体望遠鏡の像を正立像にします。
Tatsuro Matsumoto; Inventor of the EMS, Erecting Mirror System. EMS offers non reversed upright image with no additional undesirable abberations.
