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jp_stone in How to set aperture using a Canon lense adaptor on XT-1?
This worked well for me,
Not my video, but it's perhaps the fastest way to explain it to you.
https://www.youtube.com/watch?v=y1ZuK_dDweg
I used lots of Canon lenses including L glass with a 20 dollar China made adapter on my Fuji Xe1 with great results,
but I set my aperture with the Canon lens while it was still ON THE CANON BODY.
Sounds / looks goofy, but works. I set some of mine at f/8 for landscape and just left them there, worked well.
Many Canon lenses that people will say are "soft" work extremely well on a FUJI SENSOR!
I since moved fully away from Canon and am just now in Fuji.
I will say an adapted Canon 17-40L can be magical.
http://i1166.photobucket.com/albums/q611/Unstable_rider/Can-17-40L_fuji%20XE-1_zpshhluruh0.jpg~original
http://i1166.photobucket.com/albums/q611/Unstable_rider/17-40_edited_zpsfwgkymbh.jpg~original
http://i1166.photobucket.com/albums/q611/Unstable_rider/fall001_April_zps1r6l2dqq.jpg~original