Tried and Tested: ISO/Sensitivity

"Sensitivity" is basically the digital equivalent of film speed or more specifically the measurement used to define light sensitivity. For this, the D80 offers ISO values between ISO 100 to H1.0, thereby giving photographers more headroom in shutter speed and aperture control, and creativity.

The original image resized. The yellow area in this picture is crop from the original images to highlight the different ISO/Sensitivity.

These photos were taken using aperture priority mode (F/4). Noise (grains) started to appear at ISO 1000 and above. Even when ISO 1600 was used, details were not totally lost to noise and photos were still print worthy after minor resizing and cropping. Sadly, photos taken at ISO H0.3 and higher were unusable due to the massive amount of noise captured.