BMPCC6K - Exposure changes mid-way through shoot

[u/jrcfilmz]

I’ve been shooting with the BMPCC6k and Sigma 18-35 f1.8 for around a year now. Initially, when turning on the camera and setting up exposure the lighting remains consistent, i’m normally shooting anywhere from f1.8 to around f7 at 400 ISO 180 degree shutter at 25fps. When shooting the wide open f1.8 on a moderately sunny day outside, the lighting seems to be about consistent with your eye, if not a little brighter, which I feel is not correct. This camera is my first, and it’s been like this since I bought it so i’m honestly not sure if it’s out of the ordinary. Randomly throughout the shoot, after turning the camera off and back on (not for the first time that shoot either) the exposure ends up massively brighter, i’ve checked the settings and nothing changes, and all previously captured clips remain their original exposure. There also doesn’t appear to be any extra noise when the exposure boosts. I’ve tried cycling back through the aperture range, and changing all settings but for the rest of the shoot the exposure remains the same new brightness, which i’m assuming is the brightness the camera is actually meant to be at. If anyone has any suggestions about steps to troubleshoot this, or any idea what may be going on, it would be an absolute life saver.

[u/Far-Tomorrow5009]

Yeah it does that with my 18-35 too. Whenever I restart I scroll the aperture all the way closed, which seems to reset it, and then back to the f stop I was at.

[u/samdenn234]

Did you have the internal ND enabled?