5/25/2023 0 Comments Delete fixture in lxfreeA 1000W 3200K light becomes a 300W 5500K light when you put Full CTB on it. Balancing tungsten to 5500K is not very efficient because full color temperature blue correction gel (Full CTB) cuts the output of the light by 70% in converting it to 5500K. Without gelling the windows to 3200K, using 3200K balanced lights doesn’t make a lot of sense. But, where a roll of 85/ND9 gel will set you back $140.00, it will be expensive and time consuming to gel the windows if there are a lot of them. The gel both converts the exterior daylight from 5500K to 3200K and knocks down the level outside by three stops, so that lights that you can power off the wall will be effective as fill lights. If there are not many windows you can cover the windows with a combination of 85/ND9 gel. If you expose for the exterior to hold detail, your talent will be underexposed and become a near silhouette. Without either gelling the windows or substantially boosting the light levels inside, when you expose for your talent, your exterior will blow out. Because it generates approximately 70’000 FC, when shooting interiors with windows you have two problems: color temperature and contrast. The basic problem in the situation you describe is that the sun is so dam bright. Once you know how many FC you need for exposure you can figure out which lights will give you that using the photo-metrics that manufacturers provide on their websites (be wary of the photo-metrics given for LED lights.) With a little experience you begin to develop a feel what light will give you what you need in different situations. To figure out how many Foot Candles (FC) you need, all you need to know is that it takes 100 FC to get an exposure of 2.8 with an ISO 100 film with a 180 degree shutter at 24 FPS (1/50th of a second shutter speed.) If your camera is 2 stops faster than an ISO 100 film, you will need 25 FC to get a stop of 2.8. How can I determine the intensity of the light needed for the job? suppose I decided that I want to equalize lighting levels between inside and outside.
0 Comments
Leave a Reply. |