I set my ISO to about 800 in typical lighting conditions, and as the evening progresses and it gets darker, I usually have to increase my ISO to maintain a fast shutter speed.
For my wildlife photography, I usually set my aperture at f/5.6 (the widest on my lens) and keep it there the whole time. I set my ISO to about 800 in typical lighting conditions, and as the evening progresses and it gets darker, I usually have to increase my ISO to maintain a fast shutter speed.