I'm getting a really annoying barrel flare/vignette thing on this footage I shot at night w/ a torch. Check it out here. Can anybody tell me what's happening here? I am using a Canon 6D w/ an EF 28-135mm at f/3.5. It looks to me like the fire is actually illuminating the inside of the barrel, causing some weird vignetting. Does anybody have any idea how to avoid this? We'll pretty much have to use this footage as we can't get our actresses out there again, but I'd like to know how to avoid it in the future.