HI
So, I have just bought the Osmo Action, still waiting for it to be shipped, and since I have several 37mm ND filter, I was wondering if there is an adapter for ND filters this size to fit the Osmo Action so that I don't have to go and buy ND filters specifically for the OA??

Hello and good day BrianSC. Thank you for reaching out and for purchasing this DJI Osmo Action. I hope that you will get the best recommendation from our valued DJI members who has the DJI Osmo Action and uses the said adapter for those filters. In addition I am sorry to say that we do not have any adapters for the 37mm ND filter on our DJI Store. Again thank you for purchasing the DJI Osmo Action and for your support.