BMPCC, UV/IR Cut and exposure.

[MattH]

Yeah, I know what you're saying and feel like I do have the hang of it. I've been shooting with it for about 2 years now. I don't shoot ProRes personally, and I have my Zebra's set to 95% and then try to avoid them even there because I've fucked up shots having them set to 100 and then using ETTR on top of that. For this specific shot, I shot 200 ASA cause I would clip so extremely on 400 and 800. And yes I was using ND, probably 7 extra stops (My speedbooster was set to "2" and I used the Sigma ART 18-35mm). I just have to be more careful I guess. Thanks everyone for your inputs.

The bmpc and bmpcc are native iso 800. Unlike a stills camera, when you change the iso the sensor does not change its analogue gain. Instead, they apply a pre compression digital boost or pull.  Indeed, when you record raw the iso changes nothing but metadata.  So by shooting at 200 iso you are loosing 2 stops of highlight clipping lattitude over middle grey. If you are clipped at 800 you will still be clipped at 200. You need to lower the physical exposure to solve the clipping.