One small thing can completely change an image. This little thing is a camera filter. A camera filter is a small, round accessory that goes in front of the camera lens. The camera filter was invented by Edwin H. Land. In this experiment the polarizing filter, neutral density filter, diffusion filter and star effect filter will be tested. Photographers all over the world use filters to enhance their photos. The hypothesis states that if you apply a filter to the camera, the image will change. In the 1930s, Edwin H. Land was walking around New York City. He was a photographer and noticed that there were a lot of hard glares in the “Big Apple”. Land wanted to reduce this glare caused by random vibrations of light. Basically, he needed to control those vibrations by polarizing the light. In 1932, Land began breaking into laboratories late at night, when no one was there, and worked until morning. He designed a sheet of plastic containing thousands of crystals. Light would pass through these crystals and polarize the light making the image glare-free. Without Land's discovery, photographs would be different today. There are four different filters that will be tested in this experiment. There is the polarizing filter, the neutral density filter, the diffusion filter and the star effect filter. Each of these filters affects photography differently, but how? The polarizing filter improves color and contrast and also saturates the color by removing lights reflected on the surface. This filter controls unwanted reflections, uses different optical principles than other filters, and reduces daytime glare and light scattering. This filter only works at a 90 degree angle to the sun and the light source must be reflected... into the center of the paper... Digital photography for dummies. 6th ed. Indianapolis, Indiana: Wiley, 2009. Print. Digital Photography for Dummies."3 Types of 55mm Camera Filters for Special Effects." Steve's digital camera. Ed. Will Chambers. Steve's Digital Cameras and the Web. October 25, 2013. "Lens Filters: Neutral Density." Steve's digital cameras. Ed. Will Chambers. Steve's Digital Cameras and the Web. October 25, 2013. Wallace, Joseph E. "Cameras for Everyone." The camera. New York: Athenaeum for Young Readers, 2000. 67-69. Press. The invention of the turning point. Shaw, John. The wildlife photographer's complete guide to professional field techniques. New York, NY: Amphoto, 1984. Print.