Thanks for the info, but my Freewell ND filters (I have the complete kit) for Mavic 4 Pro don't have anything metallic behind,Could you show me all your box (front & back like me,Yours are very different), thank you?
First up those are not screws. They are spring balls, the balls are captured with a spring behind them.They are often used as detents which is what they are in this case. If you look at the metal tabs on the filter you can see a spot that is...
That's what happens when you use the wrong "North Dakota" filter! LOL!
Great technique to retain sharpness of individual frames for extracted stills, and still have appropriate motion blur in the edited video output!