I have an X-Pro1 and have for the longest time (past 2 years) been using the Fuji EF-X20, Polaroid ring flash, Nikon SB-80DX and Nikon SB-28 on my X-Pro1's hot shoe and they have fired reliably. Until today, only the Fuji EF-X20, and the Polaroid ring flash fire every shutter release.
I'm not sure what's going on. Any helpful tips?
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Fujifilm X-Pro1 and Nikon flash guns not firing?