I was shooting with a RED MX recently on a location that featured a lot of venetian blinds.
And I started to notice I was getting a strange horizontal flare. Well I thought it was a flare, but it seems like something more is going on.
It’s a kind of fault that can be reproduced. All you need is a venetian blind, a background behind the blind that is 3 or more stops over your base exposure and something dark(ish) in frame.
At two stops over you can *just* start to see this fault coming in, but it’s barely noticeable. By +3 you’ll definitely see it.
I even realised it doesn’t even have to be as thin as a venetian blind.
I’ve also been able to replicate this fault on an Alexa, but the clip below is from a RED.
Speaking with RED I got a vague explanation that it would happen anytime a hot source like this was near the edges of the frame and not to shoot venetians with hot backgrounds.
I’d still love to know the technicalities of what’s going on here if anyone knows ?