Nikonian72 wrote:
Apertures (f/stops) are not measured as high or low, but rather small or large. Yes, a smaller aperture will provide a miniscule increase in DoF, but at the sacrifice of overall resolution. The sharpest aperture of any lens is usually two stops closed-down from wide open. For many lenses, this is about f/5.6. Most of us shoot at f/8, f/11, or f/16, to increase DoF slightly without too much compromise of resolution.