Father, son and the holy spirit. Red, Blue and Green. Whisky, soda and ice. Beauty has always been built with blocks of three.
Well, same goes with great pictures!
All cameras, whether an ancient film camera, or a more modern digital, work in pretty much the same way. Photographs are taken by letting light fall onto a light-sensitive medium, which records the image. Traditionally, this has been film, but more recently, it tends to be a digital sensor. The more light that falls onto the film or sensor, the lighter the image.
A photograph’s exposure is determined by just three camera settings. Mastering their use is an essential part of developing an intuition for photography. With most cameras, except basic “point n shoots” you have three variables that you can control.
Shutter speed: This controls the duration of the exposure. “Shutter speed” and “exposure time” refer to the same concept, where a faster shutter speed means a shorter exposure time.
Shutter speed’s influence on exposure is perhaps the simplest of the three camera settings: it correlates exactly 1:1 with the amount of light entering the camera
With waterfalls and other creative shots, motion blur is sometimes desirable, but for most other shots this is avoided, so that the shot taken is sharp. This can be adjusted on the LCD screen of your DSLR.
Aperture Speed: A camera’s aperture setting controls the area over which light can pass through your camera lens. It is specified in terms an f-stop value, which can at times be counter-intuitive, because the area of the opening increases as the f-stop decreases.
The range of values may also vary from camera to camera (or lens to lens). For example, a compact camera might have an available range of f/2.8 to f/8.0, whereas a digital SLR camera might have a range of f/1.4 to f/32 with a portrait lens.
Higher aperture will give you a better depth of field if your shutter speed allows sufficient, but not too much light.
ISO speed: The ISO speed determines how sensitive the camera is to incoming light. Similar to shutter speed, it also correlates 1:1 with how much the exposure increases or decreases. However, unlike aperture and shutter speed, a lower ISO speed is almost always desirable, since higher ISO speeds dramatically increase image noise.
Common ISO speeds include 100, 200, 400 and 800, although many cameras also permit lower or higher values. With compact cameras, an ISO speed in the range of 50-200 generally produces acceptably low image noise, whereas with digital SLR cameras, a range of 50-800 (or higher) is often acceptable.
HOW DO WE TRADE THEM OFF?
One can therefore use many combinations of the above three settings to achieve the same exposure. The key, however, is knowing which trade-offs to make, since each setting also influences other image properties. For example, aperture affects depth of field, shutter speed affects motion blur and ISO speed affects image noise.
Now, usually a faster shutter speed will require a larger aperture to allow enough light into the camera, and a slower shutter speed will need a smaller aperture to prevent too much light from getting in. As a result, ISO speed is usually only increased from its minimum value if the desired aperture and shutter speed aren’t otherwise obtainable.
Well, folks go frame your imagination with these tips and tweaks. Share those pics with us soon!