Geez.... All these seems very complex & complicated! Do you really have the time to calculate all these aperture & stuff when you're taking pictures? By the time the equations are solved, you might have already lost the right moment for the picture liao right? ![Confused :confused: :confused:](data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7)