
“Minimum D” in the above photo means the inter-axis distance of the OTAs at the IPD of 60mm.
MATSUMOTO-EMS Innovation of Astronomical Telescope 天体望遠鏡革命
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.
“Minimum D” in the above photo means the inter-axis distance of the OTAs at the IPD of 60mm.