While many people would agree that photography is a form of art (good photography, anyhow), I want to take some time today to tell you that there’s plenty of science behind the art. There are several terms every budding photographer should become familiar with before they go out and spend tons of money on a camera which may not fulfill their specific needs. Like everything else, more expensive doesn’t necessarily mean much better. If you’re travelling around the market for a camera, then you should be looking at the following information, not the price tag, and basing your purchasing decision on these several points.
Controlling Exposure Quality
Most cameras have timers built right into them which control how long film is exposed, usually producing quality negatives which yield legible pictures. However, to really be a great photographer, I think it’s important to get more control over the picture-taking process, from beginning to end. Too much light will ruin an image by destroying whatever you’re looking at and giving back a bright, blank image. Too little light will make everything dark, sometimes too dark to see anything at all. This is why understanding the three underlying factors which control exposure quality can be of much help to a photographer. Knowing how to control the ISO, Aperture and Shutter Speed will improve your images.
Essentially, ISO is a number on a scale which represents the sensitivity of a particular camera to lighting conditions. Upgrades in technology have made it so you’re not stuck taking a whole film roll of images in whatever lighting you’re working under – many digital camera come with ISOs which can be adjusted on the fly. While a camera’s native ISO rating can vary widely (from as little as 100 to as high as 1,500+), there’s really only one thing to take away from this: A higher ISO rating provides better images in darker environments, but also increases the amount of grain and other artifacts which appear on the film. Low ISO ratings won’t give any images at all in low light or darkness, but will provide the highest quality images overall when the pictures are taken with enough lighting. This is because your camera has a harder time distinguishing between light and heat as the ISO rises; very technical stuff and certainly worth reading more about, but I think we should proceed.