The filter is in a plastic box in which he can move ... It took me to clean it before you screw it onto the Canon EF 70-200mm f4 L IS because it was full of small particles. On one of the edges, we see a trace of glue that fortunately does not interfere with shooting (otherwise I would have redirected the total). It makes its conservation authority but I'm a little disappointed in the quality of finishing, I expected better.
