Exposure

It’s all about recording light, in order to create an image that isn’t too bright or too dark. Through the use of aperture, shutter speed and ISO, we can change how much light is recorded to produce correctly exposed images. this is simply the size of the hole in the lens that light passes through. Aperture is given in f-stops, with the smaller the number indicating a larger hole for light to pass through. So an f2.8 aperture lets a lot of light in, f8 far less. Aperture also determines depth of field. This is how much will be recorded in focus – the smaller the number, the less depth of field. So at 2.8 you are going to get a minimal amount in focus, with the rest of the frame falling into blur, while at f8 you will see far more detail through the frame. SHUTTER SPEED – it does what is says on the tin. It’s the length of time it takes for the shutter to close and reopen. The faster the speed, the more the image freezes motion, with slower speeds allowing blur into an image. For bird photography most images you’ll want to shoot using the simple guideline that your shutter speed should be at least that of the length of your lens, so if you have a 300mm lens, you will want at least a 1/320 of a second shutter speed to freeze the action and ensure a sharp image. Aperture and shutter speed are linked. If you have a wide aperture of 2.8, you are letting in a large amount of light, thus the shutter speed can