100x100mm Square Black Diffusion Filter Kit Black Diffusion 1/4 Filter + Filter Holder

SKU: SKU.1915

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That depends on the lens diameter. This is usually stated on the lens. The filter holder is then attached to the lens using the appropriate adapter ring 
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So with my sigma 10 20, only a little bit at 11 mm but no longer visible at 12 mm (aps-c)