If you’re forced to shoot handheld in low light and find that even with your lens at its widest aperture, the shutter speed is still too slow to avoid camera shake, all you need to do is increase the ISO. Every time you double the ISO, the shutter speed also doubles. For example, if your camera is set to ISO 100 and the fastest shutter speed you can use is 1/8sec, then at ISO 200 it would be 1/15sec, at ISO 400 it would be 1/30sec, at ISO 800 it would be 1/60sec, at ISO 1600 it would be 1/125sec and at ISO 3200 it would be 1/250sec. The latest DSLRs offer fantastic image quality at high ISOs – a sharp but slightly grainy image is much better than a soft but grain-free image.