Takahashi-FC100DL-BINO in the planning / FC100DL-BINO プラン中

For the first check for planning the binoscope with this OTA, I checked the back-focus using an EMS-US as a gauge. The result is about 150mm of the back-focus but also found it easy to get another 30mm or more back focus by replacing the end adapter for the shorter one. (The new adapter should be made.)