NiSi M75 75mmフィルターシステム用 NiSi 39mmアダプター

I was worried about compatibility, but this little adapter threads on smoothly and holds the filter holder rock solid on my old 39mm thread lens. Definitely a must-have if you want to use those square filters on an unusual lens.

The threading onto my lens is precise and smooth, no wobble at all, and it lets my M75 holder sit perfectly flush. I double-checked the 39mm ring size before ordering and it matches my front element exactly, so my filters finally stop vignetting on that small lens.

I was worried about the adapter not fitting my older lens, but threading it onto the 67mm ring was surprisingly smooth and the 39mm side locks in without any wobble. Used it for a morning hike and the whole setup felt rock solid on the front of the glass.