I did a DIY job rigging a filter ring on my Vision's camera. Bought a 40.5mm to 46mm step-up ring ($4.00) and glued it to the beveled edge on the metal faceplate P2V's camera. The 40.5mm filter thread has in inside diameter of 38mm which is just slightly larger than the diameter of the front face of the metal faceplate ring on the PV2 camera. By chamfering/beveling the inside-back edge of the step up ring to match the beveled edge of the camera's faceplate, it made better contact for gluing, and brought the ring a few mm closer to the lens to lessen the potential of vignetting from the filters. See install photos at link below.
If I did it again, I would consider using a 40.5mm to 52mm step-up ring, for a couple of reasons. One, I have multiple 52mm filters in my photo kit, and two, I checked the results of my mod with a 46mm star filter I have, and it does result in some vignetting. The vignette is visible in stills and wide angle video, however, in both cases it is removed with the DJI lens correction filter in Photoshop. Hopefully I can find a low enough profile UV filter in 46mm that will not produce a vignette. The installed filter ring on it's own does not produce a vignette.
http://www.pbase.com/image/154022499/original.jpg
If I did it again, I would consider using a 40.5mm to 52mm step-up ring, for a couple of reasons. One, I have multiple 52mm filters in my photo kit, and two, I checked the results of my mod with a 46mm star filter I have, and it does result in some vignetting. The vignette is visible in stills and wide angle video, however, in both cases it is removed with the DJI lens correction filter in Photoshop. Hopefully I can find a low enough profile UV filter in 46mm that will not produce a vignette. The installed filter ring on it's own does not produce a vignette.
http://www.pbase.com/image/154022499/original.jpg