Now, I just use filter films (from phantomfilters.com), and then you can add your own gel to create the gradient effect.
First, Neewer do not sell gradient / graduated filters for P3S. Second, I had one of these snap-on filters, and they will overload your gimbal (the motor runs very hot). The problem is the P3S is not design to be used with a filter, if you add a weight to the lens, you should add counter balance weight on the back of the camera too.
Now, I just use filter films (from phantomfilters.com), and then you can add your own gel to create the gradient effect.
Or just shoot RAW and bracket your exposure.Still looking for good gradient sheets to cut :/