I've got a TG-4 with the Olympus PT-056 housing and have just found a PTWC-01 lens that I can get with a step-up ring that will fit onto it. My question is what is the PTWC-01 like? I haven't had much luck looking for reviews and photos for it. I'm especially wanting to know if it can do above/below water split shots and if it's worth it or if there's a better lens out there for my set-up