30mm長42mm延長管 (SFE-M42-030)

Slapped this on my telescope to get my camera sensor farther out, and the extra 30mm made all the difference for reaching focus on my nebula shots. The male threads are short but catch cleanly, no wobble at all when I tightened it down.

The female thread is impressively deep at nearly 28mm, which gives my camera side a very snug, wobble-free grip. I just wish the outer knurling was a touch more aggressive for gloved hands, but the added 30mm of length works perfectly for closer focusing.

Finally, an extension tube that fits securely without any wobble—the 1.8" outside diameter matches my setup perfectly. The 30mm length gives me just the right spacing for my camera sensor.