[Aperture Vs. Depth of Field] When you widen the aperture, the depth of field becomes shallower, and vice versa. That’s not all the Aperture does though, as it also affects the exposure. The DoF is also controlled by where you focus, and how far you are away from the subject.
Learn How To Shoot In Manual Mode - ISO, Aperture & Shutter Speed Explained Shutter Speed, ISO, Aperture ... To be comfortable shooting manual you will need to know what your necessary adjustments are. Though these settings are all numeric, there isnt some insane math equation that you need to do to find out what to dial them i