The diameter of the OTA is the same with the last one, but this time, FPD is larger by 8mm than that of the former one.

前回の五藤10cm-BINOと同じ鏡筒径ですが、EMSが大型ハウジング（＋大型ヘリコイド）仕様のため、Ｄが8㎜だけ広くなります。