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Camerabag cinema vs1/4/2024 ![]() You may do that because cinema lenses are more accurate with their aperture measurements. Fixing the exposure in post costs more, and for a feature film you may find it's cheaper to use cinema lenses instead of paying for the post work. There are scenes you shoot on different days and different places, and you need them to be matched as exposure. You need more light in terms of power consumption and more expensive camera sensors the whole industry is a lot more expensive. You have lots more people involved and for every scene you roll cameras and sound. When shooting video footage it's far more complex, as you may know. Knowing that the combination between lenses and camera sensors can lead to light meter readings inaccuracy, makes the manufacturers of cinema lenses to be more careful about their lens measurements on the barrel. You may have ISO 200 based on the light meter reading accurate on one camera and slightly off as exposure on another. Not all camera sensors are the same and ISO 200 is not the same for every camera. This also happens with the camera sensors. For example, you measure f/4.0, but on your monitor that's too light, so you change it to f/4.5, and it's just fine. This mostly happens with still camera lenses even with high end ones. Most of the time we either ignore it and fix it in post, or we simply change the aperture on the lens to compensate for that. How many of you have noticed your light meter tells a reading that's slightly off by a third or two-thirds of a stop on your reference monitor. Both measurements relate to the theoretical amount of light that enters the sensor through the lens.
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