This JetMag Pro Magnetic Adapter Ring from NiSi is designed for use with their JetMag Pro magnetic filter system. Once screwed onto the 62mm front thread of your lens, this adapter allows you to magnetically attach the 67mm filters of the JetMag Pro system. This allows you to quickly swap filters on the go to suit your needs or create your desired look. Its aluminum construction makes it highly durable, and the slim design prevents vignetting in your images.
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I have yet to go out with my camera and Nisi filter when the cap does't fall off. I know it has a lock but if the cap spins just a bit the lock is no longer engaged. Fortunately I have always been able to find the cap. Once I found it back at the trailhead where someone found it and put it in a place to find it. I like the convenience but I'm always nervous about losing the cap.
I bought this step-down ring to go with the NiSi JetMag Pro 100mm Filter Holder Kit (BH# NIMJM82M100K • MFR #NIMJM82M100K). The step-down ring is required so that you can attach the filter holder to a lens barrel. Despite its name it is NOT magnetic. The ring attaches to the filter holder with a sort of bayonet mount that does not tighten and is definitely not secure. I was afraid if I used it for an actual shoot (I bought it for the August 2026 solar eclipse) that it might fall off mid-shoot because there is no way to secure it tightly. I thought maybe I was doing something wrong, so did a video chat with a B&H product specialist. After testing the product himself, he agreed with me that it was poorly designed and he recommended that I return it, so that's what I am doing. I am replacing it with a Tiffen product that appears to be more secure (the customer service representative tested it, too), but I haven't received it yet, so I can't review it from experience. In any case, definitely avoid the Nisi filter holder and step up/down rings - I wouldn't trust my filters or my shoot to this very flimsy design. Thanks to B&H customer service, however, for helping me work through the problem and identify a (hopefully) better solution.