I have made a simple diffuser for the EF-X20 (download link in comments!) : r/fujix
Sold: Fuji EF-X20 - FM Forums
Gear Review: Fujifilm EF-X20 Flashgun – Old School Shooter
Who's using the EF-X20?: Fujifilm X System / SLR Talk Forum: Digital Photography Review
Shoe mount flash EF-X20 | Accessories | FUJIFILM X Series & GFX – Global
Alex Lambrechts on Twitter: "Fujifilm EF-X20 flash rocks! Here it is on my Leica M9, perfect combo for tonight's party :) get one! #leicam9 #XPro1 http://t.co/l6QUKjAPSz" / Twitter
Fuji - X100 with the new EF-X20 flash | Cameraderie Photography Forum
Welcome | Fujifilm
Fujifilm EF-X20 Shoe Mount Flash - Accessory – Kamerastore
Fujifilm X-Pro1 Launch & Interview with Product Manager: Hiroshi Kawahara | System camera, Fujifilm, Product launch
Design Influences - GFX50R and EF-X20 Flash: Medium Format Talk Forum: Digital Photography Review
Sold: Leica M6 Classic and 50mm Summarit F2.4, EF-X20 Flash - FM Forums
Someone asked for flashes? Fujifilm EF-X20 : r/Leica
Leica M6 Classic with EF-X20 Flash Settings? : r/Leica