Alan, yes ebay does offer that angle finder and I could probably get more information from the seller, if one of the adapters will fit the X-T1. I'm not overly impressed with the product, though I've never handled it and am making my comments from viewing the photos only. It looks like a (rough) copy of the Canon angle finder I use. While I use it, I'm not really pleased with it's adapter mounting. The original Canon adapters have formed metal with spring elements to slide onto the viewfinder. Not very stable and I've had mine come off numerous times. The ebay adapters seem plastic only items. I don't feel to confident these will last.
Barry, I've read of such applications using WiFi and ipad or iphone. I've also watched such a combination "in action". But I'm probably too old school for such a setup. I have a hard time using live view and am not too keen using such a WiFi setup. I'd greatly prefer a decent angle finder.
The best angle finders I used were from Leica and Minolta. Nice snug fit. Never had one fall off the camera. I wish I knew, If any of those good old units fits the X-T1. While I'm not against spending more money for good gear, I'd hate to buy any number of angle finders until I finally find one I like.
Thanks for your advice! I will give each more consideration.