8-12mm 長さ48mm 可変長エクステンション (SFE-M48-V)

The machining is precise—the threads on this variable extension spin on butter-smooth without any binding. I was able to dial in exactly 10mm of spacing for my reducer, and it holds firmly with no tilt or play.

I needed exactly 10mm of extra back focus for my ZWO camera, and this variable extension let me dial it in perfectly. The locking ring holds tight once you set the length.

Finally, an extension that actually lets me dial in the exact backfocus distance without stacking spacers. The variable 8-12mm range on this 48mm tube saved me so much time getting my reducer spacing perfect.