2.4吋調焦座用螺紋延長管

Getting the right spacing for my camera has always been a headache, but these extension tubes clicked together perfectly and let me dial in the exact backfocus I needed. The set of multiple lengths saved me from buying a bunch of separate adapters.

I was fighting backfocus on my ASI294 for weeks until I added this extension, and now the field lens spacing is dead on. The threads are machined well enough that there's zero wobble or light leak at the connection. Wish I'd grabbed one of these sooner instead of shimming with spacers.

Threads mated cleanly to my focuser with zero wobble. I stacked two lengths to hit the backfocus on my 294MC and stars stayed pinpoint to the corners. Nice having the exact spacing without a pile of spacers.