This 77mm Magnetic Rear Filter Cap is part of the Sensi PRO Magnetic Filter System. It is a great way to protect the rear surface of a filter after removing it from a lens. With the filter connected to a separately available Magnetic Filter Adapter Ring, this cap can be quickly attached to the rear of the magnetic ring to protect the filter from dust and scratches. Safely store the filter in a gear bag or case without the risk of damage. It can be use together with separately available 77mm Magnetic Lens Cap for complete filter protection. NOTE: This cap does not work with non-magnetic filters and lenses.

Protects Filter Rear Surface    Magnetic- and Shock-Resistant    Black Anodized Aluminum Construction    Fits MFR-77mm Magnetic Filter Adapter

Related Questions and Answers

Q: 1. Will this ring work with the discontinued Xume magnetic filter system?

A: To our knowledge, the discontinued Xume system has not be tested specifically with the Freewell Empty Magnetic Base Ring. The results may vary.

Q: 2. Will this magnetic base ring work with my 77mm Freewell Variable ND + Mist (BH #FRFW77MVNDBR)? Can you confirm that the ND + Mist filter will attach magnetically to the base ring, with no screwing required?

A: The Freewell Empty Magnetic Base Ring (77mm) will screw into the filter thread of your lens in order to hold the Freewell Mist Edition Threaded Bright Day Variable ND Filter (6-9 Stops, 77mm).

Q: 3. How would I attach my own filter to this? Is that what this is for?

A: The DZOFilm Magnetic Base for Koop Rear Filter is a spare ring that works only with the DZOFilm Koop Rear Filter Kit for Vespid / Catta Ace PL-Mount Lenses.

Q: 4. Does this cap work with the Kase KW Revolution system?

A: The Kase 82mm Skyeye Magnetic Lens Cap is incompatible with the Kase KW Revolution system.

Q: 5. This adapter is to use for normal 67mm diameter or only for M-SERIES ?

A: The SmallRig 67mm Magnetic Filter Adapter for M Series Lenses, B&H # SM3839, supports 67mm filters and also M-series lenses.

Q: 6. Would this fit with a Kase Wolverine magnetic filter?

A: Yes, the Kase KW Revolution Magnetic Inlaid Adapter Ring (82mm) is compatible with the Kase 82mm Wolverine Magnetic filter kit.

Q: 7. this SmallRig 67mm Filter Adapter for M Series Lenses is mount on the Moment phone cases?

A: The SmallRig 67mm Filter Adapter is compatiblle with a cellphone cage or case with M lens mount.

Q: 8. Is this filter magnetic?

A: No, the K&F Concept Nano-X Series CPL Filter (49mm) is not magnetic.

Q: 9. Will the front magnetic slot work, or is that also blocked by the lens hood?

A: No, the Kase Armour Magnetic Adapter Ring for Nikon Z 14-24mm f/2.8 S Lens used with the Kase 100mm holder should not block the first lost.

Q: 10. Does this filter rotate?

A: The Kase KW Revolution Magnetic CPL Filter (Silver Ring, 112mm) does rotate.