This is the same guy that made the bmpcc 4/6k mod that tilta it's selling . I speaked with him on tao app since he was still developing the bmpcc kit and he sent me one that it's still works perfectly after one and a halft year and my pocket 4k it's like a new camera . You can contact him it's a nice guy and he will send you a kit for sigma fp ,he doesn't speak english but the app has a very good translate function .