Here's a handy, step-by-step guide to using the sniper rifle in the smash-hit PlayStation 3 shooter, Killzone 2.
1. Press L2 to take cover
2. Push upward on the left stick to slide out of cover
3. Click the right stick to look down the gunsight
4. Aim with the right stick
5. Adjust the zoom by pressing up on the D-pad
6. Press R1 to fire