I purchased the 67-77 Adapter ring to allow me to use the 77mm filters that I purchased at the same time on a lens that has 67mm threads. The adapter ring screws in well and can hold the UV or ND filters without problem. However, the magnet is too strong to allow me to easily turn the Circular Polarizer. I will, eventually, decide whether to keep my screw-on filters or get the 67 magnetic filter kit for my 67mm thread lenses.
20/05/2024