After picking some wild wheat in a roadside ditch near Kalispell, Montana, I arranged it on the ground next to me. I then found a little white daisy and placed it on the wheat. With my camera and 105mm macro lens on my tripod, I set my aperture to f/16 and adjusted my shutter speed until 1/125 sec. indicated a correct exposure.

Nikon D300S with 105mm macro lens, tripod, f/16 for 1/125 sec., ISO 200