Aperture

F stop setting 2.8 is the brightest picture because it is a bigger opening so it lets in more light. F stop setting 6.4 is the darkest picture because it is a smaller opening so it lets in less light. F stop setting 2.8 has the sharpest focus in the foreground F stop setting 6.4 has allowed the background to be in better focus **10/10 Well done**