A pinhole camera is a light proof object with a small hole in the side. When light enters the hole, it leaves a mark on the other side of the object. This mark is captured by using light sensitive paper. In our particular project, we used a round object to capture the sun for more time of the day.
When light enters a pinhole camera, it hits the opposite side of the object, leaving an Upside down image of the subject that the hole is facing. A solar graph is a picture of the path of the sun at a specific point. This is done by capturing the sun day by day at an incredibly low shutter speed. This is done using a lensless "pinhole camera", put in long exposure in the sun. Solargraphs variate in different seasons and months.
The Solargraph has strange colors because of the components of the light sensitive paper. Light sensitive paper works because of the thin layer of silver(that has never been exposed to light) on it. When exposed, the silver becomes a darker color. When exposed for a very long time, like we did for the pinhole project, other layers of silver grow over the other silver, causing strange colors to emit. The strange colors do not come from the actual scene at all. In fact, the colors come from the appearance of divided silver growing on halide grains. The photo is scanned, and changed from negative to positive in the computer, which shows the latent image. With continued exposure, the image becomes a sepia, maroonish brown color. maximum exposure will create a grey shade. | David A. LawlorArchivesCategories |
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