I got my filter adapter today and installed it ... I used to shoot a Contax G2 35mm rangefinder a lot so I have plenty of 46mm filters. I put a B&W SMC UV on it and the UAV blackout sticker then stacked a B&M cir polarizer on it...... IQ was much improved as was flare and the stacking of filters vignetted the image frame a bit which I cropped out and this also took out the two lwr corner OOF/smearing issue as well. I can live with 30mp tif's and no corner issues for my stills shooting DNG's. IQ and contrast was fairly decent at -7 exp comp @100 iso cropped. I was looking at all the fine vision pics and sad to say most had a corner or two with OOF/smearing even the pics shown on the P2V+ forum. I figured I could be playing this DJI Russian Roulette sending camera after camera back and never get one totally free of this issue. Not fair to me or B&H to do this searching for the one in a million (sadly my first P2V had a fairly decent camera .. too bad it had a defective motor and ESC). So I am going to stop trying to find that one in a million and just crop my frustration away and frame the initial image wider than I normally would to compensate for this. Sad for $1200 the camera can't match a iPhone 4 but it is what it is..I will not return this one and pay more for the plus just to get the identical still issues. If they ever put a decent still camera on a future version I may consider a move but my faith in DJI products has been severely tarnished these past 5 week exposure to them. I probably won't be on the forums much anymore either as seeing all the issues posted does not make this experience enjoyable and only gives me something else to be concerned with. I will just fly and shoot what I have till it fly's away of self destructs.