Just a bit of advice: when using the DJI part # 27 Filter Holder caution is required. The extension posts that are supplied must not be over tightened. Just install them to the point that they bottom out. If you over tighten the internal posts which are plastic and will split if over tightened. It is not metal to metal. when you install them to the point that they bottom out and then you tighten the set screws on the two posts you will be fine and nothing will come loose due to the set screws on the posts neither can move. Just my two cents worth and the experience of over tightening then a visible inspection of the inside of the camera housing.