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They, as well as a lot of people using the canon camera are probably shooting in f2.8 to maximize the amount of light they get without introducing more noise or resorting to filming in 30fps in mp4 format. Using f2.8 does have more of a shallow DOF on this camera and its easier to have your subject out of focus. I personally shoot in f4 or f5.6 which seems to be the sweet spot for optimal DOF and sharpness all-around. If you are familiar with shooting with these cameras then you understand that you will need a lot more light, specially when you want to keep your ISO at base, which in RAW is 800 and that already has plenty of noise, there are "tricks" to get around the noise issue and minimize it as much as possible while still shooting in RAW (which has a ton of noise) at the expense of dynamic range. Which in all honesty, for porn, who really cares about dynamic range???? You have controlled lighting 95%+ of the time anyways. It can be tricky to get the best image out of it while still keeping all these factors into consideration in order to avoid having to do some major denoising on the 8k footage, those of you who have tried know damn well attempting to denoise the 8k footage is not practical at all. So far I have come up with a workflow that does compromise dynamic range but gives me an image that is 90%+ acceptable to me without having to denoise, the better your lighting is, the better it looks straight out of the camera with very minor tweaking. These studios need more time to play with this system and iron out all the major kinks they are dealing with now.