M54 (F) متوسط 6 فتحات مع محول مانع للضوء (020070)

The 4mm thickness is perfect for my imaging train, keeps everything tight without adding bulk. No light leaks at all thanks to the adapter, which fixed the gradient issues I kept getting on long exposures. Threads are smooth and it screwed right onto my camera without any play.

The six through holes made mounting my filter wheel way easier than the single-threaded adapter I had before. Threads are machined cleanly and the lightproof piece actually seals — no more faint glow creeping into long exposures.

Even with a small spacing budget, the 4mm thickness kept everything rigid, and the lightproof adapter completely eliminated any stray glow from my setup.