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The Cavision 85mm to 72mm Threaded Metal Deep Offset Step-up Adapter Ring is useful for clamping on a matte box when the matte box needs to be pushed back quite a bit further on the lens, to avoid vignetting. It is recommended for clamp-on use when using wider angle DSLR lenses, as it will allow the matte box to sit further back in relation to the lens front; it is especially useful for this purpose. This adapter ring screws onto the lens front filter thread.
Attaches to filter thread of camera lens; can be used to step up to matte box back-mount opening. Obstructions such as bayonet notches may prevent this adapter ring from fitting on some lenses.