If you set your camera to an f-stop of around f/2 or f/2.8, it means that the aperture blades in your lens are open fairly wide, capturing a lot of light.
As you may have heard before, your aperture value is written in f-stops. If you set your camera to an f-stop of around f/2 or f/2.8, it means that the aperture blades in your lens are open fairly wide, capturing a lot of light. As you jump the f-stop to higher numbers like f/4, f/5.6, f/8, f/11, f/16, f/22, and so on, it means that you are closing the aperture blades more and more, which results in much less light being captured.