Hey this is a glowing rubber band, color of your choice, that stops lens rotation for lenses that don't have an internal lock. Simply place it on the lens, slide it to the very edge of the lens and when not shooting, slide it forward to hook (overlap) the outer lens barrel. When you're ready to shoot, just move it back. Why not just use that rubber band you stole from your stationery? It's much thicker, stronger, less prone to breakage, glides without rolling and comes in cool colors.
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