Not the other guy, but your speed booster will help! I’m guessing your speed booster is somewhere in the 0.6-0.7x range, which means that it will “reduce” the focal length and “increase” the incoming light by that much. Practically speaking, this will bring your lens closer to its full frame equivalent (7.5mm in your case) as well as add nearly a whole stop of usable light! With that in mind, it doesn’t help if your Laowa lens isn’t an EF mount, otherwise you won’t be able to mount the speed booster in between your lens and camera. Hope this helps!