I understand what apature is... I understand what it can do to photographs... but I've been bouncing this back and forth in my head, and it just dosen't make sense. Can someone explain how it works. A larger apature, smaller f value, lets in more light, softens background images... I get all of it except how it softens backgrounds. I would think that the more light that gets in, it would alow for more focus on backgrounds and would give you MORE depth of field, not less. Why is this so?