But this small adapter ring is not the proper filter holder: the latter, which is about 8 mm thick, comes oversee the ring attached to the camera. It has a diameter roughly equivalent to the lens of the camera. If we add the thickness of the filter (3mm), we arrive at a total increase of 11 mm thick that there should be before buying a case, if you will leave the filter permanently, this Sony advises. The filter holder is fixed and senlève by two very easy to use pliers, almost too much as it is possible not to grip the filter door on one side, and the risk is great to lose the filter and its door filter. If so ergonomics of all seems a bit complicated, the quality is very good. I do not think the other systems offered for sale are more practical because the device is small and its objective is as high as the device itself, which makes attaching accessory on the challenging goal.