Adams's regional pao optical theory

Adams's regional exposure theory United States well-known photographer Ansel Adams ' zone · exposure theory, is more than half a century of photography is one of the basic theory of science. Adams in his writings the negatives and photographs in the book on this had made a detailed presentation.

Adams's regional exposure theory United States well-known photographer Ansel Adams ' zone · exposure theory, is more than half a century of photography is one of the basic theory of science.

Adams in his writings the negatives and photographs in the book on this had made a detailed presentation. He describes the way although more complex, however, is extremely useful. It was pointed out that, once mastered this approach, even a novice photographer to be able to do the experienced veteran, press the shutter before we can expect the resulting photo is what looks like. As long as you have in this way, the photographer will learn to analyze the scene to the scene, elbow more accurate metering and metering results make appropriate exposure to scenes of visual impressions on faithfully or creatively and now photos. According to Adams's theory, black and white photos of tone or ash-can be divided into ten "region", consisting of zero range (photo to be able to demonstrate some of the most black) to tenth region (photo of background-white). The fifth area was a medium gray, it is in light meter readings derived by exposure; the third region is the detail section, and the mingying eight regions are details of some strong light. With regional system, photographers will be able to see photos of the neck of the final image, and the film according to photographer idea ideas to light. A simple example, it is a measure of the amount of light and shadows, to make this section to have more details, and will stop increasing levels; and measure major light part of the amount of light, according to the regional system theory, the light parts than shaded off a five-level, if mingying part is the third area, light part is the eighth district. If this is the photographer of immediate to shoot. If you want to make the light parts have more levels, the photographer can shorten the negatives of the developer time to reduce the contrast, the eighth region becomes the seventh district. On the contrary, if you want to make important shaded with more levels, but this section also compares the bright parts of the dark third-level, the developer can increase time to increase the contrast of the picture, so that the light parts get lighter. Of course, to make their theoretical exposure area, you must make some exposure and the developer of the test, the more cumbersome, and will not repeat them. The following describes Adams of works and photography through to his regional exposure method can. The winter storm was Adams 1940 taken at Yosemite National Park in a painting. It was a day in early December. Storm initially mixed with rain, then snow and rain was until noon the weather began to become clear. Adams drive to a new found ability to stir the creative inspiration of shooting point, standing here can see the Yosemite Valley charming scenery. He immediately set up 8 x 10 camera, with 121/4-inch Kodak lens, on the slopes of XV and screen composition at the bottom is a choice. And then wait for the clouds forming in the upper portion of the screen and moving shapes. In order to avoid the clouds mobile image blur caused by the exposure to ask a very short. For this, if you are using a normal average readings of exposure, in accordance with the normal developer, negative contrast is very low. Clouds are grey, Sun bright part looking pale and shaded the very soft c Adams used regional exposure method, before he has taken to anticipate the final photo is outside it. So he conducted a series of regional metering. When point-and-light meter is not yet available. Adams recalls: "I am positive the light meter with a section of the tube, and put it in perspective down to about 15. Or so, of course, I need to use 4 to go to take the side of the optical table measured on any part of the brightness values. In this scene, I can conclude that the CSA performance misled the brightest part of the brightness of 160 candlelight/square feet, the brightness on 7. I found that the right of the darkest tree has a brightness (metering results are 3 candles/square foot) falls within a zone. Due to the woods with a thin snow, its average brightness falls area and three districts. In addition to the solid arrow-shaped bright falls, the brightest portion to be clouds. I waterfalls approximately 500 of brightness and candle light/square foot. In order to increase the brightness of the trees, I could make the exposure increase twice to four times, but this may lose I think the photo will show it's some kind of transparent light. In view of the negatives of such a minimum of the exposure, the developer is to increase than the normal range. This makes (originally located 7) high brightness achieved 8 brightness standards and various shading levels will generally appear bright. "Print out of the film preserves Adams to reflect the information that has been in the anechoic chamber in some degree of blocking and light, have a very vivid photos. This was in his view a faithful reproduction.

Adams in summary he used regional exposure method when shooting practice said: "I found that if I follow the regional system provided by accuracy, on the expected image active imagination, I took out of the effect is almost always desirable, at least technically.

However, a simple calculation errors may be caused by serious consequences, for example, forget to pick up the lens ring or filter factor into consideration. It should be remembered that in case of complicated cases shooting fails, each photo exposure records, which shall include the exposure details as well as the developer indicates that can be used as a reference at the time of diagnosis. ”