Just want to ask everyone.. when taking portraits/headshots (head and shoulders) how do you make sure your subject's eyes are both sharp and focused? I noticed in some of my pictures, one eye is not as sharp as the other. I'm already using f4.0 or f5.6 since I also want a 'not-so-shallow-depth-of-field' effect. I'f I'm shooting at F1.8 or f2.8, id understand if i get one eye not as sharp as the other. But since I'm already using F5.6, howcome sometimes the eyes are not both sharp?
Let's assume that I'm taking pictures outdoors and the sun is bright as usual and my shutter speed is around 1/250 - 1/500 (no camera shake at all), AF-S & exposure is ok. Only one focus point (the one at the center) is selected. How do you focus the eyes? Do you focus one eye and when AF locks, recompose in between the 2 eyes before you press the shutter? Or straight away focus in between the eyes, use a smaller aperture like F7.1 and press the shutter - to make sure both eyes are sharp and still have a nice depth of field?
Thanks for reading!