I don't have my inspire yet... I'm a round 3 pre-order.  I ordered Nov. 28th.  I'm getting very excited for the drone.  I'm wondering where I can purchase different lens filters?  What spec do I need to find additional filters that will work with the inspire 1?

I was told its 43mm. Trying to get confirmation before I plonk down money for grad ND filters

it has been reported to be 37mm.