I have made low-profiled adapters in answer to the request of my clients who also wish to use 48mm filters with them
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.
I have made low-profiled adapters in answer to the request of my clients who also wish to use 48mm filters with them