Well, I had to remove the 40.5mm nd filter I was attempting to use on my c23 and reinstall the default lens protector that came with the drone. I actually spent around $70 on an ND and a hoya super hmc UV for it, which I now can't do anything with. Apparently, the gimbal is precisely balanced only for the c23 without filters or ANY additional weight whatsoever, because it vibrated excessively with the filter installed after a few moments of turning on the drone. Terrible shaking in the image. The problem stopped immediately when filter was removed and I went back to the factory setup w/ no filter. I even tried holding the camera level while powering on. No go. My big question is, why does Yuneec include a filter adapter ring if you can't use filters?