IT’S difficult to get sharp images when shooting extreme close-ups or when using a long telephoto lens – even with the camera on a tripod. Mirror-bounce is the culprit. It’s caused by the reflex mirror flipping up prior to the exposure. This can jar the camera, giving blurred results. ‘Mirror lockup’ is a function available on most Canon cameras. Enable this and, if you’re not using a remote controller, also select a two-second self-timer delay. When you press the shutter button, the mirror will flip up but the shutter won’t open until two seconds later.