Aperture is the size of your lens’ opening that allows light to pass through your lens to your camera’s sensor. A bit of confusion in regards to aperture is the smaller your lens’ number , say 1.4, the larger your lens’ opening….got it? A larger opening will also allow for faster shutter speeds since more light passes through the lens. Another advantage of a larger aperture is an increased depth of field. Purchasing a lens with the largest aperture you can afford will add to the possibilities of your photography.