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F.lux vs twilight8/9/2023 ![]() Now we can look this up on a EV/Lux conversion chart such as this one by Sekonic. So lets plug that into the equation to arrive at an EV value. So we know our general illuminance level is likely to be somewhere around 50 lux, that’s how much light is likely to be falling on our subject. It’s a living room, and we will be shooting at 24fps with a standard 180-degree shutter (or 1/48th sec) and we want to maintain a nice, shallow DoF with an f/stop of f/2.8. Let’s say we know we are planning the shoot to be interior nighttime. Any combination of aperture and shutter speed that results in the same EV value will result in the same exposure. Understanding Light: Exposure ValueĮxposure Value (EV) is a scale representing the combination of aperture f/stop and shutter speed. Of course, it depends on frame rate, shutter speed and ISO (or EI). What does this mean in terms of exposure? Typical lux values of surfaces illuminated by:Ġ.0001 lux – Moonless, overcast night sky.Ġ.002 lux – Moonless clear night sky with airglow.Ġ.27–1.0 lux – Full moon on a clear night.ģ.4 lux – Dark limit of civil twilight under a clear sky.Ĩ0 lux – Office building hallway/toilet lighting.Ĥ00 lux – Sunrise or sunset on a clear day.ġ000 lux – Overcast day typical TV studio lighting.ġ0000–25000 lux – Full daylight (not direct sun). So, just how bright is 1 lux? Understanding Light: Illuminance Remember also that light intensity falls off inversely to the square root of the distance from the source. A flux of 1000 lumens, concentrated into an area of one square metre, lights up that square metre with an illuminance of 1000 lux. The difference between the units lumen and lux is that the lux takes into account the area over which the luminous flux is spread. ![]() ![]() The Lumen is a measure of the total quantity of visible light emitted by a source (luminous flux). With that said, here are a few basic concepts that should be at the forefront of what we do. ![]() Of course for documentary and news, as well as most of us without Hollywood-sized crews and budgets, we’ve been shooting in available light for a long time, and will continue to do so. It wasn’t his first time either, and with continual improvements in sensitivity, we’ll see an increase in the number of high-profile films executed by smaller crews shooting only in the natural light that is available to them. More than ever we’re concerned with low light performance, and creative cinematographers are becoming more flexible than ever when it comes to how they use light.Įmmanuel “Chivo” Lubezki recently did the seemingly unthinkable for a Hollywood feature, shooting The Revenant using only available light. Light is one of those mysterious things we all know, but rarely stop to think about in much detail. Here are some useful facts and figures that may shed new light on your understanding of illumination. ![]()
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