48mm 母轉 42mm 公轉接環 (SFA-F48M42-008)

I'm surprised how well this adapter holds the camera even with a heavy zoom lens attached; the threads cut cleanly into both the filter and the T-ring with no wobble. Definitely stays put during long exposures.

Threads on both ends are clean and snug, so the M48 to M42 conversion felt solid when I attached my field flattener. The extra 8mm of spacing was easy to account for in my optical train, and it did exactly what it needed to for my setup.

I was a bit worried about adding 8mm of spacing to my setup, but it fits perfectly and the threads are machined cleanly. No wobble or play at all.