See how results differ as you adjust metering for these photographs. Adjust aperture and shutter speed using the sliders. The time of an exposure is (unless longer than one minute) the reciprocal of a shutter speed setting { t = 1/[the number selected]}, e.g., if you set shutter speed to 125, the exposure time will be 1/125th of a second. To make your photograph, press the space bar. You'll see the results of your light metering for 3 seconds, then you can adjust settings again, and/or try with a different backdrop.