On 6008, i at least, on the right side, under the aperture preview button located under the strap, there is a button that you slide from "norm" to sp. On sp, once you press the shutter, there will be a timer of 10s that will count down in the viewfinder. At 2 sec, the mirror will flap up. You can also stop the timer. I`m not sure how exactly of the combination of shutter button or putting back to norm.
On 6008, i at least, on the right side, under the aperture preview button located under the strap, there is a button that you slide from "norm" to sp. On sp, once you press the shutter, there will be a timer of 10s that will count down in the viewfinder. At 2 sec, the mirror will flap up. You can also stop the timer. I`m not sure how exactly of the combination of shutter button or putting back to norm.