Exposure, in the photography world, is a very broad term and you'll need to understand it better. Your camera has manual modes like Aperture, Shutter, Program, and Manual. Aperture Mode allows you to control the f-stop on the camera and the camera will adjust everything else. Shutter is similar to Aperture but controls the shutter speed. Program is essentially an auto setting and Manual allows for full manual control over the camera. Most professionals tend to use Manual. Reading your camera's meter also comes into play here.
With shooting in Manual exposure comes learning a couple of key new terms:
Shutter Speed: Your camera has a shutter, and it can stay open for certain amounts of time depending on what the user dials into the camera. It is typically displayed as a fraction or a whole number. For example:
The longer the shutter speed the more motion that will be captured and the steadier the photographer needs to remain. This is great for capturing nighttime scenes. As a note, use a tripod.
The faster the shutter speed the less motion will be captured. This is great for capturing fast moving objects like sports action. On your camera, this can be seen with the S mode.
F-Stop: This is also known as your Aperture. Your aperture not only controls how much of your image is in focus or not, but like your shutter speed it can also control how much light comes into the lens of your camera and hits the sensor (the equivalent of film.) In general:
On your camera this is also known as AV mode.
ISO: The ISO (or ASA as it was in the film days) is the current light sensitivity setting of your camera's sensor. The general rule is the higher the ISO, the more sensitive your camera will be to light and the grainier your images will be. The grain is also known and often referred to as image noise. In contrast, the lower the ISO, the less sensitive the camera will be to light and the less grain will appear on your images. Higher ISOs allow for faster shutter speeds. Similarly, larger sensors allow for less grain at higher ISO settings.
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