YOU SAID:
I have a telescope with a 10mm aperture
INTO JAPANESE
口径10mmの望遠鏡を持っています
BACK INTO ENGLISH
I have a telescope with a diameter of 10mm.
INTO JAPANESE
直径10mmの望遠鏡を持っています。
BACK INTO ENGLISH
I have a telescope with a diameter of 10mm.
You've done this before, haven't you.