ISO 25,600 seems to be a little over kill but I was determined to find a reason to use it!
For those of you that don’t really know what ISO is, it’s the rating for light sensitivity and film grain (the same as ASA/DIN in film). The higher the ISO, the more light sensitive and grainer it becomes. You will see this in practice in the photos below. As a comparison, most compact cameras shoot between ISO 50 and 400. Whist many entry level digital SLR’s shoot at ISO 100-3200. Some now shoot upto ISO 12,800.
These two photographs were taken at around 1/5 second at f4, ISO 25,600 at 19:00 in the middle of winter. It was cold, dark and we had the most amazing birthday picnic on top of a hill!
It was completely dark and I couldn’t see the faces of the people around. Incredibly, the camera managed to capture more detail than I could with my eyes.