lol this is pretty ironic ,but i'll give you the real answer lenses ex. wide angle or a fisheye come in these standard sizes 37mm, 43mm, 58mm, and 72mm. For your camera you have the choice of buying a 37mm or a 43mm, in order to get from a 39mm to a 43mm or a 39mm to a 37mm you will have to buy a step up or step down ring. This ring attaches to the threads of your lens and then you can now put on the lens with the size you choosed.
Everyone be reppin the tall tees I be reppin the small tees.