NiSi Cinema 4x5.65'' Pure Clear Filter Lenses & Lens Accessories It has a T-Knob locking

It has a T-Knob locking mechanism and a safety cable

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NiSi Cinema 4x5.65'' Pure Clear Filter Lenses & Lens Accessories It has a T-Knob lockingThe NiSi Cinema 4x5. 65'' Pure Clear Filter is a simple, clear filter with a 1x filter factor and is designed to provide general protection for your lens. This optically clear filter does not affect exposure or overall image quality while helping to prevent dust, scratches, moisture, and other elements from reaching or damaging your lens.