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.
Here is how to calculate the light-path of EMS, again. I had posted the same title in the Support Corner begore. The light-path consists of 3-parts, 1,2,3. “3” is in common with all the EMS with the normal 2″ sleeve of 58mm; as 18+2+58=78mm. “1” is also in common with EMS-UM & UL. “1” of EMS-UXL is 36mm. “2” of the larger Binoscope has no relation with the type of the EMS. It can be measured by the “D”(OTA distance) and the IPD. Assuming that the D is 200mm and the IPD is 60mm, the path-2 will be ” ((200-60)/2 )x sqr.2 = 99mm. The total light path is 1+2+3.