Hi all, I'm extremely new to cameras and videography. On my EOS RP I'm shooting in movie manual mode. I'm seeing some odd behavior and wondering if it rings a bell for anyone: I noticed that in some recordings (maybe 1 out of 4?) the entire image will dim for a few seconds, then brighten again back to normal -- sometimes more than once in a single recording. For example, I was making a little movie with friends in my apartment, and in a 1.5 minute shot, in each of six takes, the entire image would darken about 20-30% for 2-3 seconds, then brighten again back to normal. It happened twice in each take, about 15-20 seconds in and again about 60 seconds in, with surprising consistency across takes. I didn't notice the dimming in the viewfinder because I was watching the scene, but I saw it in the recording files after. Because the entire image dims uniformly, I don't suspect an issue with my lights. And it's at similar times in each shot, so it feels like a camera software thing but I'm not sure. I've checked that obvious culprits are off, like auto exposure, auto white balance, and auto focus. The last thing I can think of is it tends to happen in longer-distance shots like 8-10 feet from the subjects, with an aperture like f/8 to f/10, shutter 1/50. Not sure if that's relevant. Has anyone seen this behavior before? Let me know if I should give more info, thanks.
Your EOS RP is dimming because some auto-exposure features are still active. Turn off Auto ISO, Highlight Tone Priority, Auto Lighting Optimizer, and Anti-Flicker. This may stops the brightness shifts.
Thanks. I checked all these and found that Auto Lighting Optimizer was still on, so I turned it off. I'll see if that helps.
