I removed the Fuji thread protector ring but this exposes a male thread, unusual for this industry. Actually I had forgotten what was on there because I removed it on the first day and installed a protective glass over the movable focus mechanism. I am travelling and the original trim is at home in the box. I looked at the Filter Adapter Ring on eBay and that is what I require. I don't want to order the Raynox lens until I know it will fit. And yes I will get the step down ring as well to make a better job of it. Thank you for your assistance Jamie, you have been most helpful. If anyone is interested in this conversation, the X100T makes an excellent lightweight hiking camera, with a very suitable focal length for landscapes. The Raynox lens will be for macro when hiking as I've found I am getting too much dust into my X-T1 changing lenses and extension tubes. Another great use for this superb little camera!